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d in (-oo:+oo)
(2/5)*d+2 = -((1/5)*d)-26/5 // + -((1/5)*d)-26/5
(2/5)*d+(1/5)*d-(-26/5)+2 = 0
(2/5)*d+(1/5)*d+26/5+2 = 0
3/5*d+36/5 = 0 // - 36/5
3/5*d = -36/5 // : 3/5
d = -36/5/3/5
d = -12
d = -12
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