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n in (-oo:+oo)
4*n-(5*n)+5 = 7 // - 7
4*n-(5*n)-7+5 = 0
4*n-5*n-7+5 = 0
-n-2 = 0 // + 2
-n = 2 // * -1
n = -2
n = -2
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