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n in (-oo:+oo)
7-(2*n) = 17-4*n // - 17-4*n
7-(2*n)-(-4*n)-17 = 0
4*n-2*n-17+7 = 0
2*n-10 = 0 // + 10
2*n = 10 // : 2
n = 10/2
n = 5
n = 5
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