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n in (-oo:+oo)
7*n+5 = 93-4*n // - 93-4*n
7*n-(-4*n)-93+5 = 0
7*n+4*n-93+5 = 0
11*n-88 = 0 // + 88
11*n = 88 // : 11
n = 88/11
n = 8
n = 8
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