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