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3*x-(2/8) = 30 // - 30
3*x-(2/8)-30 = 0
3*x-1/4-30 = 0
3*x-121/4 = 0 // + 121/4
3*x = 121/4 // : 3
x = 121/4/3
x = 121/12
x = 121/12
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