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-2(r-25)=-50
We move all terms to the left:
-2(r-25)-(-50)=0
We add all the numbers together, and all the variables
-2(r-25)+50=0
We multiply parentheses
-2r+50+50=0
We add all the numbers together, and all the variables
-2r+100=0
We move all terms containing r to the left, all other terms to the right
-2r=-100
r=-100/-2
r=+50
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