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x in (-oo:+oo)
(x+6)/3 = 7 // - 7
(x+6)/3-7 = 0
(x+6)/3+(-7*3)/3 = 0
x-7*3+6 = 0
x-15 = 0
(x-15)/3 = 0
(x-15)/3 = 0 // * 3
x-15 = 0
x-15 = 0 // + 15
x = 15
x = 15
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