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x in (-oo:+oo)
(x-y)/6 = M // - M
(x-y)/6-M = 0
(x-y)/6+(6*(-M))/6 = 0
6*(-M)+x-y = 0
x-6*M-y = 0
(x-6*M-y)/6 = 0
(x-6*M-y)/6 = 0 // * 6
x-6*M-y = 0
x-6*M-y = 0 // + -6*M-y
x = -(-6*M-y)
x = y-(-6*M)
x = y-(-6*M)
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