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x in (-oo:+oo)
4*(x+3) = -36 // + 36
4*(x+3)+36 = 0
4*(x+3)+36 = 0
4*x+48 = 0
4*x+48 = 0
4*x+48 = 0 // - 48
4*x = -48 // : 4
x = -48/4
x = -12
x = -12
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