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(4*(x+3))/6+(15*(2*x-1))/6 = (30*(x-1))/6 // - (30*(x-1))/6
(4*(x+3))/6+(15*(2*x-1))/6-((30*(x-1))/6) = 0
(4*(x+3))/6+(15*(2*x-1))/6-5*(x-1) = 0
(4*(x+3))/6+(15*(2*x-1))/6+(-5*6*(x-1))/6 = 0
4*(x+3)+15*(2*x-1)-5*6*(x-1) = 0
34*x-30*x-3+30 = 0
4*x+27 = 0
(4*x+27)/6 = 0
(4*x+27)/6 = 0 // * 6
4*x+27 = 0
4*x+27 = 0 // - 27
4*x = -27 // : 4
x = -27/4
x = -27/4
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