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d in (-oo:+oo)
3*d+3 = 7*d+35 // - 7*d+35
3*d-(7*d)-35+3 = 0
3*d-7*d-35+3 = 0
-4*d-32 = 0 // + 32
-4*d = 32 // : -4
d = 32/(-4)
d = -8
d = -8
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