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d in (-oo:+oo)
2*d+(2/5)*d+8 = 88/5 // - 88/5
2*d+(2/5)*d-(88/5)+8 = 0
2*d+(2/5)*d-88/5+8 = 0
12/5*d-48/5 = 0 // + 48/5
12/5*d = 48/5 // : 12/5
d = 48/5/12/5
d = 4
d = 4
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