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a in (-oo:+oo)
-(7*a)-2 = 3*a-112 // - 3*a-112
112-(7*a)-(3*a)-2 = 0
112-7*a-3*a-2 = 0
110-10*a = 0 // - 110
-10*a = -110 // : -10
a = -110/(-10)
a = 11
a = 11
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