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d in (-oo:+oo)
(1/3)*d+(5/3)*d+4 = -8 // + 8
(1/3)*d+(5/3)*d+4+8 = 0
2*d+12 = 0 // - 12
2*d = -12 // : 2
d = -12/2
d = -6
d = -6
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