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Subtract Port from both sides:
A - Port = P + Port - Port
A - Port = P
In general, for linear equations such as this, you collect all the terms containing the variable of interest. If there are such terms on both sides of the equation, you subtract the terms on one side from both sides. Then you have all the terms containing the variable on one side. Now, you subtract everything else on that side from both sides, as was done above.
Example
3p + 6 = 2p - 4 - 5p (starting expression I just made up)
3p + 6 = p(2 - 5) - 4 = -3p - 4 (collect terms containing p)
3p - 3p + 6 = -3p - 3p - 4 (subtract 3p from both sides, to eliminate that term from the left side)
6 = -6p - 4 (collect terms, again)
6 - (-4) = -6p - 4 - (-4) (subtract everything that isn't a p term from the side containing the p terms)
10 = -6p (collect terms)
10/-6 = p (divide both sides by -6. This is the final step in the solution for the value of p.)
-(1 2/3) = p
A - Port = P + Port - Port
A - Port = P
In general, for linear equations such as this, you collect all the terms containing the variable of interest. If there are such terms on both sides of the equation, you subtract the terms on one side from both sides. Then you have all the terms containing the variable on one side. Now, you subtract everything else on that side from both sides, as was done above.
Example
3p + 6 = 2p - 4 - 5p (starting expression I just made up)
3p + 6 = p(2 - 5) - 4 = -3p - 4 (collect terms containing p)
3p - 3p + 6 = -3p - 3p - 4 (subtract 3p from both sides, to eliminate that term from the left side)
6 = -6p - 4 (collect terms, again)
6 - (-4) = -6p - 4 - (-4) (subtract everything that isn't a p term from the side containing the p terms)
10 = -6p (collect terms)
10/-6 = p (divide both sides by -6. This is the final step in the solution for the value of p.)
-(1 2/3) = p
0
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