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+15=4R-6
We move all terms to the left:
+15-(4R-6)=0
We get rid of parentheses
-4R+6+15=0
We add all the numbers together, and all the variables
-4R+21=0
We move all terms containing R to the left, all other terms to the right
-4R=-21
R=-21/-4
R=5+1/4
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