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x in (-oo:+oo)
(x+2)/3 = 15 // - 15
(x+2)/3-15 = 0
(x+2)/3+(-15*3)/3 = 0
x-15*3+2 = 0
x-43 = 0
(x-43)/3 = 0
(x-43)/3 = 0 // * 3
x-43 = 0
x-43 = 0 // + 43
x = 43
x = 43
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