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d in (-oo:+oo)
12*d-((1/3)*(9-(6*d))) = 25 // - 25
12*d-((1/3)*(9-(6*d)))-25 = 0
(-1/3)*(9-6*d)+12*d-25 = 0
12*d-1/3*(9-6*d)-25 = 0
12*d-1/3*(9-6*d)-25 = 0
14*d-25-3 = 0
14*d-28 = 0
14*d-28 = 0
14*d-28 = 0 // + 28
14*d = 28 // : 14
d = 28/14
d = 2
d = 2
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