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c in (-oo:+oo)
3*c-(8*(1/4-(6*c))) = 15 // - 15
3*c-(8*(1/4-(6*c)))-15 = 0
3*c-8*(1/4-6*c)-15 = 0
3*c-8*(1/4-6*c)-15 = 0
51*c-15-2 = 0
51*c-17 = 0
51*c-17 = 0
51*c-17 = 0 // + 17
51*c = 17 // : 51
c = 17/51
c = 1/3
c = 1/3
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