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