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3*x-5.7 = 5/2 // - 5/2
3*x-(5/2)-5.7 = 0
3*x-5/2-5.7 = 0
3*x-8.2 = 0 // + 8.2
3*x = 8.2 // : 3
x = 8.2/3
x = 2.73333333
x = 2.73333333
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