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(2)=2R-5
We move all terms to the left:
(2)-(2R-5)=0
We get rid of parentheses
-2R+5+2=0
We add all the numbers together, and all the variables
-2R+7=0
We move all terms containing R to the left, all other terms to the right
-2R=-7
R=-7/-2
R=3+1/2
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