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d in (-oo:+oo)
2*d = (3/4)*(2+5) // - (3/4)*(2+5)
2*d-((3/4)*(2+5)) = 0
2*d+(-3/4)*(2+5) = 0
2*d-21/4 = 0 // + 21/4
2*d = 21/4 // : 2
d = 21/4/2
d = 21/8
d = 21/8
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