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3*x-(18/8) = 18/7 // - 18/7
3*x-(18/8)-(18/7) = 0
3*x-9/4-18/7 = 0
3*x-135/28 = 0 // + 135/28
3*x = 135/28 // : 3
x = 135/28/3
x = 45/28
x = 45/28
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