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x in (-oo:+oo)
(x-18)/7 = 6 // - 6
(x-18)/7-6 = 0
(x-18)/7+(-6*7)/7 = 0
x-6*7-18 = 0
x-60 = 0
(x-60)/7 = 0
(x-60)/7 = 0 // * 7
x-60 = 0
x-60 = 0 // + 60
x = 60
x = 60
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