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d in (-oo:+oo)
2*d+d-(4/5) = 7/10 // - 7/10
2*d+d-(4/5)-(7/10) = 0
2*d+d-4/5-7/10 = 0
3*d-3/2 = 0 // + 3/2
3*d = 3/2 // : 3
d = 3/2/3
d = 1/2
d = 1/2
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