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d in (-oo:+oo)
4*d-(7*d)-2/3 = -56/3 // + -56/3
4*d-(7*d)-2/3-(-56/3) = 0
4*d-7*d-2/3+56/3 = 0
18-3*d = 0 // - 18
-3*d = -18 // : -3
d = -18/(-3)
d = 6
d = 6
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