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16r-8+4r=2(10r-4)
We move all terms to the left:
16r-8+4r-(2(10r-4))=0
We add all the numbers together, and all the variables
20r-(2(10r-4))-8=0
We calculate terms in parentheses: -(2(10r-4)), so:We get rid of parentheses
2(10r-4)
We multiply parentheses
20r-8
Back to the equation:
-(20r-8)
20r-20r+8-8=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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