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5+r/4=7
We move all terms to the left:
5+r/4-(7)=0
We add all the numbers together, and all the variables
r/4-2=0
We multiply all the terms by the denominator
r-2*4=0
We add all the numbers together, and all the variables
r-8=0
We move all terms containing r to the left, all other terms to the right
r=8
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