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x in (-oo:+oo)
(3*(x-3))/3 = 15 // - 15
(3*(x-3))/3-15 = 0
x-15-3 = 0
x-15-3 = 0
x-18 = 0
x-18 = 0
x-18 = 0 // + 18
x = 18
x = 18
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