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