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d in (-oo:+oo)
(9*d)/10+3/10-2 = 2*d-(3*d)+4 // - 2*d-(3*d)+4
(9*d)/10-(2*d)+3*d+3/10-4-2 = 0
(9*d)/10-2*d+3*d+3/10-4-2 = 0
19/10*d-57/10 = 0 // + 57/10
19/10*d = 57/10 // : 19/10
d = 57/10/19/10
d = 3
d = 3
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