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Assuming the entire LHS expressions is divided by 7 we get
m2-9 = 7
so m2-16 = 0
so (m+4)(m-4)=0
so m = 4 or m = -4
m2-9 = 7
so m2-16 = 0
so (m+4)(m-4)=0
so m = 4 or m = -4
0
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