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d in (-oo:+oo)
4*d-(6*d)-3/7 = -143/7 // + -143/7
4*d-(6*d)-3/7-(-143/7) = 0
4*d-6*d-3/7+143/7 = 0
20-2*d = 0 // - 20
-2*d = -20 // : -2
d = -20/(-2)
d = 10
d = 10
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