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d in (-oo:+oo)
5*(2*d+1) = 15 // - 15
5*(2*d+1)-15 = 0
5*(2*d+1)-15 = 0
10*d-10 = 0
10*d-10 = 0
10*d-10 = 0 // + 10
10*d = 10 // : 10
d = 10/10
d = 1
d = 1
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