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n in (-oo:+oo)
-(5*n)-7 = 5*n-57 // - 5*n-57
57-(5*n)-(5*n)-7 = 0
57-5*n-5*n-7 = 0
50-10*n = 0 // - 50
-10*n = -50 // : -10
n = -50/(-10)
n = 5
n = 5
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