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x in (-oo:+oo)
6*(3*x+7) = 6 // - 6
6*(3*x+7)-6 = 0
6*(3*x+7)-6 = 0
18*x+36 = 0
18*x+36 = 0
18*x+36 = 0 // - 36
18*x = -36 // : 18
x = -36/18
x = -2
x = -2
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