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(100-(4*x))/3 = (5*x+6)/4+6 // - (5*x+6)/4+6
(100-(4*x))/3-((5*x+6)/4)-6 = 0
(100-4*x)/3-((5*x+6)/4)-6 = 0
(100-4*x)/3+(-1*(5*x+6))/4-6 = 0
(4*(100-4*x))/(3*4)+(-1*3*(5*x+6))/(3*4)+(-6*3*4)/(3*4) = 0
4*(100-4*x)-1*3*(5*x+6)-6*3*4 = 0
382-31*x-72 = 0
310-31*x = 0
(310-31*x)/(3*4) = 0
(310-31*x)/(3*4) = 0 // * 3*4
310-31*x = 0
310-31*x = 0 // - 310
-31*x = -310 // : -31
x = -310/(-31)
x = 10
x = 10
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