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d in (-oo:+oo)
2*d-((1/3)*(6-(15*d))) = 12 // - 12
2*d-((1/3)*(6-(15*d)))-12 = 0
(-1/3)*(6-15*d)+2*d-12 = 0
2*d-1/3*(6-15*d)-12 = 0
2*d-1/3*(6-15*d)-12 = 0
7*d-12-2 = 0
7*d-14 = 0
7*d-14 = 0
7*d-14 = 0 // + 14
7*d = 14 // : 7
d = 14/7
d = 2
d = 2
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