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