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(480-(6*x))/3 = (480-(2*x))/4 // - (480-(2*x))/4
(480-(6*x))/3-((480-(2*x))/4) = 0
(480-6*x)/3-((480-2*x)/4) = 0
(480-6*x)/3+(-1*(480-2*x))/4 = 0
(4*(480-6*x))/(3*4)+(-1*3*(480-2*x))/(3*4) = 0
4*(480-6*x)-1*3*(480-2*x) = 0
480-18*x = 0
(480-18*x)/(3*4) = 0
(480-18*x)/(3*4) = 0 // * 3*4
480-18*x = 0
480-18*x = 0 // - 480
-18*x = -480 // : -18
x = -480/(-18)
x = 80/3
x = 80/3
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