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=2R+(-300)
We move all terms to the left:
-(2R+(-300))=0
We calculate terms in parentheses: -(2R+(-300)), so:We get rid of parentheses
2R+(-300)
We add all the numbers together, and all the variables
2R-300
Back to the equation:
-(2R-300)
-2R+300=0
We move all terms containing R to the left, all other terms to the right
-2R=-300
R=-300/-2
R=+150
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