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-200=r/4
We move all terms to the left:
-200-(r/4)=0
We add all the numbers together, and all the variables
-(+r/4)-200=0
We get rid of parentheses
-r/4-200=0
We multiply all the terms by the denominator
-r-200*4=0
We add all the numbers together, and all the variables
-1r-800=0
We move all terms containing r to the left, all other terms to the right
-r=800
r=800/-1
r=-800
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