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x in (-oo:+oo)
2*(x+3) = -18 // + 18
2*(x+3)+18 = 0
2*(x+3)+18 = 0
2*x+24 = 0
2*x+24 = 0
2*x+24 = 0 // - 24
2*x = -24 // : 2
x = -24/2
x = -12
x = -12
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