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d in (-oo:+oo)
-8 = d+(1/4)*d-3 // - d+(1/4)*d-3
3-d-((1/4)*d)-8 = 0
(-1/4)*d-d-8+3 = 0
-5/4*d-5 = 0 // + 5
-5/4*d = 5 // : -5/4
d = 5/(-5/4)
d = -4
d = -4
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