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d in (-oo:+oo)
5*(1*d+1) = -20 // + 20
5*(1*d+1)+20 = 0
5*(d+1)+20 = 0
5*(d+1)+20 = 0
5*d+25 = 0
5*d+25 = 0
5*d+25 = 0 // - 25
5*d = -25 // : 5
d = -25/5
d = -5
d = -5
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