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d in (-oo:+oo)
(3/4)*d-11 = (1/4)*d-(13/2) // - (1/4)*d-(13/2)
(3/4)*d-((1/4)*d)+13/2-11 = 0
(3/4)*d+(-1/4)*d+13/2-11 = 0
1/2*d-9/2 = 0 // + 9/2
1/2*d = 9/2 // : 1/2
d = 9/2/1/2
d = 9
d = 9
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