Solve for R
R=20
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320=R+R\times 15
Multiply 5 and 3 to get 15.
320=16R
Combine R and R\times 15 to get 16R.
16R=320
Swap sides so that all variable terms are on the left hand side.
R=\frac{320}{16}
Divide both sides by 16.
R=20
Divide 320 by 16 to get 20.
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