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