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d in (-oo:+oo)
2*d+2/5 = 12/5 // - 12/5
2*d+2/5-(12/5) = 0
2*d+2/5-12/5 = 0
2*d-2 = 0 // + 2
2*d = 2 // : 2
d = 2/2
d = 1
d = 1
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