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x in (-oo:+oo)
(x+8)/3+1+2 = 0
(x+8)/3+(1*3)/3+(2*3)/3 = 0
x+1*3+2*3+8 = 0
x+6+11 = 0
x+17 = 0
(x+17)/3 = 0
(x+17)/3 = 0 // * 3
x+17 = 0
x+17 = 0 // - 17
x = -17
x = -17
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