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