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n in (-oo:+oo)
7*n+2 = 112-3*n // - 112-3*n
7*n-(-3*n)-112+2 = 0
7*n+3*n-112+2 = 0
10*n-110 = 0 // + 110
10*n = 110 // : 10
n = 110/10
n = 11
n = 11
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