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x in (-oo:+oo)
(x-6)/8 = 7 // - 7
(x-6)/8-7 = 0
(x-6)/8+(-7*8)/8 = 0
x-7*8-6 = 0
x-62 = 0
(x-62)/8 = 0
(x-62)/8 = 0 // * 8
x-62 = 0
x-62 = 0 // + 62
x = 62
x = 62
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