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0.5*x-(2/3) = 2/5 // - 2/5
0.5*x-(2/3)-(2/5) = 0
0.5*x-2/3-2/5 = 0
0.5*x-16/15 = 0 // + 16/15
0.5*x = 16/15 // : 0.5
x = 16/15/0.5
x = 2.13333334
x = 2.13333334
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