solve equation and verify solution
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6(2×-(7-5×))=7(9×-(3+4×))
6(2×-7+5×)=7(9×-3-4×)
12×-42+30×=63×-21-28×
12×+30×-63×+28×=42-21
70×-63×=21
7×=21
×=21/7
×=3
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