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d in (-oo:+oo)
6*d+6 = 2*d+10 // - 2*d+10
6*d-(2*d)-10+6 = 0
6*d-2*d-10+6 = 0
4*d-4 = 0 // + 4
4*d = 4 // : 4
d = 4/4
d = 1
d = 1
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