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x in (-oo:+oo)
3*(1*x+6) = 30 // - 30
3*(1*x+6)-30 = 0
3*(x+6)-30 = 0
3*(x+6)-30 = 0
3*x-12 = 0
3*x-12 = 0
3*x-12 = 0 // + 12
3*x = 12 // : 3
x = 12/3
x = 4
x = 4
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