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2*x-(13/28) = -4/7 // + -4/7
2*x-(13/28)-(-4/7) = 0
2*x-13/28+4/7 = 0
2*x+3/28 = 0 // - 3/28
2*x = -3/28 // : 2
x = -3/28/2
x = -3/56
x = -3/56
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