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(1/2)*x+3*x+x+2000 = 56000 // - 56000
(1/2)*x+3*x+x-56000+2000 = 0
9/2*x-54000 = 0 // + 54000
9/2*x = 54000 // : 9/2
x = 54000/9/2
x = 12000
x = 12000
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