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d in (-oo:+oo)
(3/4)*d-(1/2) = 7 // - 7
(3/4)*d-(1/2)-7 = 0
(3/4)*d-1/2-7 = 0
3/4*d-15/2 = 0 // + 15/2
3/4*d = 15/2 // : 3/4
d = 15/2/3/4
d = 10
d = 10
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