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n in (-oo:+oo)
7*n+5/8 = -275/8 // + -275/8
7*n+5/8-(-275/8) = 0
7*n+5/8+275/8 = 0
7*n+35 = 0 // - 35
7*n = -35 // : 7
n = -35/7
n = -5
n = -5
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