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n in (-oo:+oo)
4*n+7 = -4*n-73 // + -4*n-73
4*n-(-4*n)+7+73 = 0
4*n+4*n+7+73 = 0
8*n+80 = 0 // - 80
8*n = -80 // : 8
n = -80/8
n = -10
n = -10
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