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x/2-6.8 = 13.3 // - 13.3
x/2-13.3-6.8 = 0
1/2*x-20.1 = 0 // + 20.1
1/2*x = 20.1 // : 1/2
x = 20.1/1/2
x = 40.2
x = 40.2
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