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x in (-oo:+oo)
3*x-2 = 6*x+7 // - 6*x+7
3*x-(6*x)-7-2 = 0
3*x-6*x-7-2 = 0
-3*x-9 = 0 // + 9
-3*x = 9 // : -3
x = 9/(-3)
x = -3
x = -3
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