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25=4r-16
We move all terms to the left:
25-(4r-16)=0
We get rid of parentheses
-4r+16+25=0
We add all the numbers together, and all the variables
-4r+41=0
We move all terms containing r to the left, all other terms to the right
-4r=-41
r=-41/-4
r=10+1/4
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