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d in (-oo:+oo)
(7/12)*d+3 = (-1/6)*d // - (-1/6)*d
(7/12)*d-((-1/6)*d)+3 = 0
(7/12)*d+(1/6)*d+3 = 0
3/4*d+3 = 0 // - 3
3/4*d = -3 // : 3/4
d = -3/3/4
d = -4
d = -4
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