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d in (-oo:+oo)
5*d+10 = 3*d+18 // - 3*d+18
5*d-(3*d)-18+10 = 0
5*d-3*d-18+10 = 0
2*d-8 = 0 // + 8
2*d = 8 // : 2
d = 8/2
d = 4
d = 4
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