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d in (-oo:+oo)
-267/4 = (-1/4)*d-(6*d)+2 // - (-1/4)*d-(6*d)+2
6*d-((-1/4)*d)-267/4-2 = 0
(1/4)*d+6*d-267/4-2 = 0
25/4*d-275/4 = 0 // + 275/4
25/4*d = 275/4 // : 25/4
d = 275/4/25/4
d = 11
d = 11
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