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d in (-oo:+oo)
d+10 = (-1/4)*d+75/4 // - (-1/4)*d+75/4
d-((-1/4)*d)-(75/4)+10 = 0
d+(1/4)*d-75/4+10 = 0
5/4*d-35/4 = 0 // + 35/4
5/4*d = 35/4 // : 5/4
d = 35/4/5/4
d = 7
d = 7
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