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x in (-oo:+oo)
29 = 6*x-(3*x)-7 // - 6*x-(3*x)-7
3*x-(6*x)+7+29 = 0
3*x-6*x+7+29 = 0
36-3*x = 0 // - 36
-3*x = -36 // : -3
x = -36/(-3)
x = 12
x = 12
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