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4(2r-10)=16
We move all terms to the left:
4(2r-10)-(16)=0
We multiply parentheses
8r-40-16=0
We add all the numbers together, and all the variables
8r-56=0
We move all terms containing r to the left, all other terms to the right
8r=56
r=56/8
r=7
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