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a in (-oo:+oo)
4*a-(6*a)-6 = 10 // - 10
4*a-(6*a)-10-6 = 0
4*a-6*a-10-6 = 0
-2*a-16 = 0 // + 16
-2*a = 16 // : -2
a = 16/(-2)
a = -8
a = -8
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