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2r=4/10
We move all terms to the left:
2r-(4/10)=0
We add all the numbers together, and all the variables
2r-(+4/10)=0
We get rid of parentheses
2r-4/10=0
We multiply all the terms by the denominator
2r*10-4=0
Wy multiply elements
20r-4=0
We move all terms containing r to the left, all other terms to the right
20r=4
r=4/20
r=1/5
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