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n in (-oo:+oo)
4*n+2 = 5*n-7 // - 5*n-7
4*n-(5*n)+2+7 = 0
4*n-5*n+2+7 = 0
9-n = 0 // - 9
-n = -9 // * -1
n = 9
n = 9
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