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a in (-oo:+oo)
-14 = 6*a-3*a+10 // - 6*a-3*a+10
-(-3*a)-(6*a)-14-10 = 0
3*a-6*a-14-10 = 0
-3*a-24 = 0 // + 24
-3*a = 24 // : -3
a = 24/(-3)
a = -8
a = -8
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