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5*x-((1/2)*x) = 20 // - 20
5*x-((1/2)*x)-20 = 0
5*x+(-1/2)*x-20 = 0
9/2*x-20 = 0 // + 20
9/2*x = 20 // : 9/2
x = 20/9/2
x = 40/9
x = 40/9
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