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a in (-oo:+oo)
125 = 6*a+7*a+8 // - 6*a+7*a+8
125-(6*a)-(7*a)-8 = 0
125-6*a-7*a-8 = 0
117-13*a = 0 // - 117
-13*a = -117 // : -13
a = -117/(-13)
a = 9
a = 9
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