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n in (-oo:+oo)
7*n-5 = 58-2*n // - 58-2*n
7*n-(-2*n)-58-5 = 0
7*n+2*n-58-5 = 0
9*n-63 = 0 // + 63
9*n = 63 // : 9
n = 63/9
n = 7
n = 7
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