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d in (-oo:+oo)
6*d+4/5 = (-1/2)*d-(317/10) // - (-1/2)*d-(317/10)
6*d-((-1/2)*d)+4/5+317/10 = 0
6*d+(1/2)*d+4/5+317/10 = 0
13/2*d+65/2 = 0 // - 65/2
13/2*d = -65/2 // : 13/2
d = -65/2/13/2
d = -5
d = -5
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