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a in (-oo:+oo)
7-6*a = 3*a-56 // - 3*a-56
7-6*a-(3*a)+56 = 0
7-6*a-3*a+56 = 0
63-9*a = 0 // - 63
-9*a = -63 // : -9
a = -63/(-9)
a = 7
a = 7
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