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0.86=x/200
We move all terms to the left:
0.86-(x/200)=0
We add all the numbers together, and all the variables
-(+x/200)+0.86=0
We get rid of parentheses
-x/200+0.86=0
We multiply all the terms by the denominator
-x+(0.86)*200=0
We add all the numbers together, and all the variables
-1x+172=0
We move all terms containing x to the left, all other terms to the right
-x=-172
x=-172/-1
x=+172
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