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x in (-oo:+oo)
(x-y)/7 = 67 // - 67
(x-y)/7-67 = 0
(x-y)/7+(-67*7)/7 = 0
x-y-67*7 = 0
x-y-469 = 0
(x-y-469)/7 = 0
(x-y-469)/7 = 0 // * 7
x-y-469 = 0
x-y-469 = 0 // + -y-469
x = -(-y-469)
x = y+469
x = y+469
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