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d in (-oo:+oo)
(3*d)/4-(1/5) = 7 // - 7
(3*d)/4-(1/5)-7 = 0
(3*d)/4-1/5-7 = 0
3/4*d-36/5 = 0 // + 36/5
3/4*d = 36/5 // : 3/4
d = 36/5/3/4
d = 48/5
d = 48/5
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