Solve for R
R = \frac{28}{5} = 5\frac{3}{5} = 5.6
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400=24\left(5+\frac{5R}{4}\right)+20R
Multiply both sides of the equation by 4.
400=120+24\times \frac{5R}{4}+20R
Use the distributive property to multiply 24 by 5+\frac{5R}{4}.
400=120+6\times 5R+20R
Cancel out 4, the greatest common factor in 24 and 4.
400=120+30R+20R
Multiply 6 and 5 to get 30.
400=120+50R
Combine 30R and 20R to get 50R.
120+50R=400
Swap sides so that all variable terms are on the left hand side.
50R=400-120
Subtract 120 from both sides.
50R=280
Subtract 120 from 400 to get 280.
R=\frac{280}{50}
Divide both sides by 50.
R=\frac{28}{5}
Reduce the fraction \frac{280}{50} to lowest terms by extracting and canceling out 10.
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