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4+8=2R+10
We move all terms to the left:
4+8-(2R+10)=0
We add all the numbers together, and all the variables
-(2R+10)+12=0
We get rid of parentheses
-2R-10+12=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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