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4*x-(18/7) = x // - x
4*x-x-(18/7) = 0
4*x-x-18/7 = 0
3*x-18/7 = 0 // + 18/7
3*x = 18/7 // : 3
x = 18/7/3
x = 6/7
x = 6/7
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