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8(2-2r)=-4r+16
We move all terms to the left:
8(2-2r)-(-4r+16)=0
We add all the numbers together, and all the variables
8(-2r+2)-(-4r+16)=0
We multiply parentheses
-16r-(-4r+16)+16=0
We get rid of parentheses
-16r+4r-16+16=0
We add all the numbers together, and all the variables
-12r=0
r=0/-12
r=0
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