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d in (-oo:+oo)
2/5-(6*d) = (-3/5)*d-59 // - (-3/5)*d-59
2/5-(6*d)-((-3/5)*d)+59 = 0
(3/5)*d-6*d+2/5+59 = 0
297/5-27/5*d = 0 // - 297/5
-27/5*d = -297/5 // : -27/5
d = -297/5/(-27/5)
d = 11
d = 11
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