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40-(40*87.9/200)=20x
We move all terms to the left:
40-(40*87.9/200)-(20x)=0
We add all the numbers together, and all the variables
-20x+40-(+40*87.9/200)=0
We get rid of parentheses
-20x+40-40*87.9/200=0
We multiply all the terms by the denominator
-20x*200+40*200-40*87.9=0
We add all the numbers together, and all the variables
-20x*200+4484=0
Wy multiply elements
-4000x+4484=0
We move all terms containing x to the left, all other terms to the right
-4000x=-4484
x=-4484/-4000
x=1+121/1000
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