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a in (-oo:+oo)
-(3*a)-4 = 6*a-31 // - 6*a-31
31-(3*a)-(6*a)-4 = 0
31-3*a-6*a-4 = 0
27-9*a = 0 // - 27
-9*a = -27 // : -9
a = -27/(-9)
a = 3
a = 3
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