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Solve for R
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27-4R-5R=0
Subtract 5R from both sides.
27-9R=0
Combine -4R and -5R to get -9R.
-9R=-27
Subtract 27 from both sides. Anything subtracted from zero gives its negation.
R=\frac{-27}{-9}
Divide both sides by -9.
R=3
Divide -27 by -9 to get 3.