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4(r-5)=2
We move all terms to the left:
4(r-5)-(2)=0
We multiply parentheses
4r-20-2=0
We add all the numbers together, and all the variables
4r-22=0
We move all terms containing r to the left, all other terms to the right
4r=22
r=22/4
r=5+1/2
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