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200=x+0.21x-0.15x
We move all terms to the left:
200-(x+0.21x-0.15x)=0
We add all the numbers together, and all the variables
-(+1.06x)+200=0
We get rid of parentheses
-1.06x+200=0
We move all terms containing x to the left, all other terms to the right
-1.06x=-200
x=-200/-1.06
x=188+0.72/1.06
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