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x in (-oo:+oo)
3*(x/3+2) = -15 // + 15
3*(x/3+2)+15 = 0
3*(1/3*x+2)+15 = 0
3*(1/3*x+2)+15 = 0
x+21 = 0
x+21 = 0
x+21 = 0 // - 21
x = -21
x = -21
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