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7+r/2=6
We move all terms to the left:
7+r/2-(6)=0
We add all the numbers together, and all the variables
r/2+1=0
We multiply all the terms by the denominator
r+1*2=0
We add all the numbers together, and all the variables
r+2=0
We move all terms containing r to the left, all other terms to the right
r=-2
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