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10=r/4+7
We move all terms to the left:
10-(r/4+7)=0
We get rid of parentheses
-r/4-7+10=0
We multiply all the terms by the denominator
-r-7*4+10*4=0
We add all the numbers together, and all the variables
-1r+12=0
We move all terms containing r to the left, all other terms to the right
-r=-12
r=-12/-1
r=+12
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