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n in (-oo:+oo)
7-n = -7*n-41 // + -7*n-41
7-n-(-7*n)+41 = 0
7*n-n+7+41 = 0
6*n+48 = 0 // - 48
6*n = -48 // : 6
n = -48/6
n = -8
n = -8
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