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d in (-oo:+oo)
d+1/7 = (-1/2)*d+191/14 // - (-1/2)*d+191/14
d-((-1/2)*d)+1/7-(191/14) = 0
d+(1/2)*d+1/7-191/14 = 0
3/2*d-27/2 = 0 // + 27/2
3/2*d = 27/2 // : 3/2
d = 27/2/3/2
d = 9
d = 9
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