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d in (-oo:+oo)
(3/5)*d+4 = 56/5 // - 56/5
(3/5)*d-(56/5)+4 = 0
(3/5)*d-56/5+4 = 0
3/5*d-36/5 = 0 // + 36/5
3/5*d = 36/5 // : 3/5
d = 36/5/3/5
d = 12
d = 12
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