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n in (-oo:+oo)
5*(1*n+2) = 40 // - 40
5*(1*n+2)-40 = 0
5*(n+2)-40 = 0
5*(n+2)-40 = 0
5*n-30 = 0
5*n-30 = 0
5*n-30 = 0 // + 30
5*n = 30 // : 5
n = 30/5
n = 6
n = 6
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