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(13*x+5)/3 = 3*x+7 // - 3*x+7
(13*x+5)/3-(3*x)-7 = 0
(13*x+5)/3-3*x-7 = 0
(13*x+5)/3+(-3*3*x)/3+(-7*3)/3 = 0
13*x-3*3*x-7*3+5 = 0
4*x-21+5 = 0
4*x-16 = 0
(4*x-16)/3 = 0
(4*x-16)/3 = 0 // * 3
4*x-16 = 0
4*x-16 = 0 // + 16
4*x = 16 // : 4
x = 16/4
x = 4
x = 4
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