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4-7=6R+9
We move all terms to the left:
4-7-(6R+9)=0
We add all the numbers together, and all the variables
-(6R+9)-3=0
We get rid of parentheses
-6R-9-3=0
We add all the numbers together, and all the variables
-6R-12=0
We move all terms containing R to the left, all other terms to the right
-6R=12
R=12/-6
R=-2
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