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a in (-oo:+oo)
4*a-(6*a)-6 = -30 // + 30
4*a-(6*a)-6+30 = 0
4*a-6*a-6+30 = 0
24-2*a = 0 // - 24
-2*a = -24 // : -2
a = -24/(-2)
a = 12
a = 12
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