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(R)=160R-0.4^2
We move all terms to the left:
(R)-(160R-0.4^2)=0
We get rid of parentheses
R-160R+0.4^2=0
We add all the numbers together, and all the variables
-159R+0.16=0
We move all terms containing R to the left, all other terms to the right
-159R=-0.16
R=-0.16/-159
R=0.16/159
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