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d in (-oo:+oo)
(2/3)*d+2 = (-4/7)*d-(38/7) // - (-4/7)*d-(38/7)
(2/3)*d-((-4/7)*d)+38/7+2 = 0
(2/3)*d+(4/7)*d+38/7+2 = 0
26/21*d+52/7 = 0 // - 52/7
26/21*d = -52/7 // : 26/21
d = -52/7/26/21
d = -6
d = -6
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