(3a+7) × (3a+7) -84a = (3a-7)× (3a-7)
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(3a+7)×(3a+7)-84a=(3a-7)×(3a-7)
9a^2+21a+21a-84a+49=9a^2-21a-21a+49
9a^2+42a+49=9a^2-42a+49
42a=-42a
42a+42a=0
84a=0
a=0/84
a=0
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