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d in (-oo:+oo)
(2/3)*d+12 = -((2/5)*d)-4 // + -((2/5)*d)-4
(2/3)*d+(2/5)*d+4+12 = 0
16/15*d+16 = 0 // - 16
16/15*d = -16 // : 16/15
d = -16/16/15
d = -15
d = -15
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