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3*x+x-(2/4)+57/7 = 13 // - 13
3*x+x-(2/4)+57/7-13 = 0
3*x+x-1/2+57/7-13 = 0
4*x-75/14 = 0 // + 75/14
4*x = 75/14 // : 4
x = 75/14/4
x = 75/56
x = 75/56
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