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a in (-oo:+oo)
-31 = 4*a+2*a+5 // - 4*a+2*a+5
-(4*a)-(2*a)-31-5 = 0
-4*a-2*a-31-5 = 0
-6*a-36 = 0 // + 36
-6*a = 36 // : -6
a = 36/(-6)
a = -6
a = -6
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