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n in (-oo:+oo)
5-5*n = 7*n+125 // - 7*n+125
5-5*n-(7*n)-125 = 0
5-5*n-7*n-125 = 0
-12*n-120 = 0 // + 120
-12*n = 120 // : -12
n = 120/(-12)
n = -10
n = -10
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