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d in (-oo:+oo)
(3/4)*d-11 = (1/4)*d-(61/2) // - (1/4)*d-(61/2)
(3/4)*d-((1/4)*d)+61/2-11 = 0
(3/4)*d+(-1/4)*d+61/2-11 = 0
1/2*d+39/2 = 0 // - 39/2
1/2*d = -39/2 // : 1/2
d = -39/2/1/2
d = -39
d = -39
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