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d in (-oo:+oo)
7*d-4*d-(3/5) = -6/5 // + -6/5
7*d-4*d-(3/5)-(-6/5) = 0
7*d-4*d-3/5+6/5 = 0
3*d+3/5 = 0 // - 3/5
3*d = -3/5 // : 3
d = -3/5/3
d = -1/5
d = -1/5
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