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8+r/2=-4
We move all terms to the left:
8+r/2-(-4)=0
We add all the numbers together, and all the variables
r/2+12=0
We multiply all the terms by the denominator
r+12*2=0
We add all the numbers together, and all the variables
r+24=0
We move all terms containing r to the left, all other terms to the right
r=-24
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