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n in (-oo:+oo)
7*n+8 = -6*n-83 // + -6*n-83
7*n-(-6*n)+8+83 = 0
7*n+6*n+8+83 = 0
13*n+91 = 0 // - 91
13*n = -91 // : 13
n = -91/13
n = -7
n = -7
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