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