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4000=50x+0.5(20x)
We move all terms to the left:
4000-(50x+0.5(20x))=0
We add all the numbers together, and all the variables
-(+50.52x)+4000=0
We get rid of parentheses
-50.52x+4000=0
We move all terms containing x to the left, all other terms to the right
-50.52x=-4000
x=-4000/-50.52
x=79+3.05479452055/17.301369863
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