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d in (-oo:+oo)
(1/2)*(8*d-2) = 2*d+7 // - 2*d+7
(1/2)*(8*d-2)-(2*d)-7 = 0
(1/2)*(8*d-2)-2*d-7 = 0
1/2*(8*d-2)-2*d-7 = 0
1/2*(8*d-2)-2*d-7 = 0
2*d-7-1 = 0
2*d-8 = 0
2*d-8 = 0
2*d-8 = 0 // + 8
2*d = 8 // : 2
d = 8/2
d = 4
d = 4
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