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2*x-(3*(1/2)) = 20 // - 20
2*x-(3*(1/2))-20 = 0
2*x-3/2-20 = 0
2*x-43/2 = 0 // + 43/2
2*x = 43/2 // : 2
x = 43/2/2
x = 43/4
x = 43/4
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