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n in (-oo:+oo)
n+3 = 83-7*n // - 83-7*n
n-(-7*n)-83+3 = 0
n+7*n-83+3 = 0
8*n-80 = 0 // + 80
8*n = 80 // : 8
n = 80/8
n = 10
n = 10
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