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x-(0.13x)=800
We move all terms to the left:
x-(0.13x)-(800)=0
We add all the numbers together, and all the variables
x-(+0.13x)-800=0
We get rid of parentheses
x-0.13x-800=0
We add all the numbers together, and all the variables
0.87x-800=0
We move all terms containing x to the left, all other terms to the right
0.87x=800
x=800/0.87
x=919+0.47000000000003/0.87
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