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d in (-oo:+oo)
(4/7)*d-((4/7)*d)-2 = -2 // + 2
(4/7)*d-((4/7)*d)-2+2 = 0
(-4/7)*d+(4/7)*d-2+2 = 0
0 = 0
d naleu017Cy do R
d in (-oo:+oo)
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