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d in (-oo:+oo)
-((3/4)*d)-10 = -55/4 // + -55/4
-((3/4)*d)-(-55/4)-10 = 0
(-3/4)*d+55/4-10 = 0
15/4-3/4*d = 0 // - 15/4
-3/4*d = -15/4 // : -3/4
d = -15/4/(-3/4)
d = 5
d = 5
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