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a in (-oo:+oo)
-56/5 = 7*a-6*a+4/5 // - 7*a-6*a+4/5
-(-6*a)-(7*a)-56/5-(4/5) = 0
6*a-7*a-56/5-4/5 = 0
-a-12 = 0 // + 12
-a = 12 // * -1
a = -12
a = -12
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