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d in (-oo:+oo)
(4-(2*d))/5 = 6 // - 6
(4-(2*d))/5-6 = 0
(4-2*d)/5-6 = 0
(4-2*d)/5+(-6*5)/5 = 0
4-2*d-6*5 = 0
-2*d-26 = 0
(-2*d-26)/5 = 0
(-2*d-26)/5 = 0 // * 5
-2*d-26 = 0
-2*d-26 = 0 // + 26
-2*d = 26 // : -2
d = 26/(-2)
d = -13
d = -13
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