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(7/12)*(1*x-3) = (1/3)*x+4/1 // - (1/3)*x+4/1
(7/12)*(1*x-3)-((1/3)*x)-(4/1) = 0
(7/12)*(x-3)+(-1/3)*x-4 = 0
7/12*(x-3)-x/3-4 = 0
(7/12*3*(x-3))/3-x/3+(-4*3)/3 = 0
7/12*3*(x-3)-x-4*3 = 0
3/4*x-12-21/4 = 0
3/4*x-69/4 = 0
(3/4*x-69/4)/3 = 0
(3/4*x-69/4)/3 = 0 // * 3
3/4*x-69/4 = 0
3/4*x-69/4 = 0 // + 69/4
3/4*x = 69/4 // : 3/4
x = 69/4/3/4
x = 23
x = 23
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