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2(4-r)=6
We move all terms to the left:
2(4-r)-(6)=0
We add all the numbers together, and all the variables
2(-1r+4)-6=0
We multiply parentheses
-2r+8-6=0
We add all the numbers together, and all the variables
-2r+2=0
We move all terms containing r to the left, all other terms to the right
-2r=-2
r=-2/-2
r=1
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