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(4*x-28)/3 = (3*x+21)/4 // - (3*x+21)/4
(4*x-28)/3-((3*x+21)/4) = 0
(4*x-28)/3+(-1*(3*x+21))/4 = 0
(4*(4*x-28))/(3*4)+(-1*3*(3*x+21))/(3*4) = 0
4*(4*x-28)-1*3*(3*x+21) = 0
7*x-175 = 0
(7*x-175)/(3*4) = 0
(7*x-175)/(3*4) = 0 // * 3*4
7*x-175 = 0
7*x-175 = 0 // + 175
7*x = 175 // : 7
x = 175/7
x = 25
x = 25
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