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