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(7*x-1)/3 = 2*x+1 // - 2*x+1
(7*x-1)/3-(2*x)-1 = 0
(7*x-1)/3-2*x-1 = 0
(7*x-1)/3+(-2*3*x)/3+(-1*3)/3 = 0
7*x-2*3*x-1*3-1 = 0
x-3-1 = 0
x-4 = 0
(x-4)/3 = 0
(x-4)/3 = 0 // * 3
x-4 = 0
x-4 = 0 // + 4
x = 4
x = 4
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