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n in (-oo:+oo)
(n-2)/(-7) = 10 // - 10
(n-2)/(-7)-10 = 0
(n-2)/(-7)+(-10*(-7))/(-7) = 0
n-10*(-7)-2 = 0
n+68 = 0
(n+68)/(-7) = 0
(n+68)/(-7) = 0 // * -7
n+68 = 0
n+68 = 0 // - 68
n = -68
n = -68
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