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2(5r-2)-4r=16-4r
We move all terms to the left:
2(5r-2)-4r-(16-4r)=0
We add all the numbers together, and all the variables
2(5r-2)-4r-(-4r+16)=0
We add all the numbers together, and all the variables
-4r+2(5r-2)-(-4r+16)=0
We multiply parentheses
-4r+10r-(-4r+16)-4=0
We get rid of parentheses
-4r+10r+4r-16-4=0
We add all the numbers together, and all the variables
10r-20=0
We move all terms containing r to the left, all other terms to the right
10r=20
r=20/10
r=2
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