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3*(1/2)*x-(1*x)+9 = 20 // - 20
3*(1/2)*x-(1*x)-20+9 = 0
3*(1/2)*x-x-20+9 = 0
1/2*x-11 = 0 // + 11
1/2*x = 11 // : 1/2
x = 11/1/2
x = 22
x = 22
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