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d in (-oo:+oo)
-4/5 = (-3/4)*d+(4/5)*d-1 // - (-3/4)*d+(4/5)*d-1
1-((-3/4)*d)-((4/5)*d)-4/5 = 0
(3/4)*d+(-4/5)*d-4/5+1 = 0
1/5-1/20*d = 0 // - 1/5
-1/20*d = -1/5 // : -1/20
d = -1/5/(-1/20)
d = 4
d = 4
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