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x in (-oo:+oo)
3*(x+6) = 36/12 // - 36/12
3*(x+6)-(36/12) = 0
3*(x+6)-3 = 0
3*(x+6)-3 = 0
3*x+15 = 0
3*x+15 = 0
3*x+15 = 0 // - 15
3*x = -15 // : 3
x = -15/3
x = -5
x = -5
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