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a in (-oo:+oo)
-(6*a)-(5*a)-10 = -142 // + 142
142-(6*a)-(5*a)-10 = 0
142-6*a-5*a-10 = 0
132-11*a = 0 // - 132
-11*a = -132 // : -11
a = -132/(-11)
a = 12
a = 12
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