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(R)=0.8R-2500
We move all terms to the left:
(R)-(0.8R-2500)=0
We get rid of parentheses
R-0.8R+2500=0
We add all the numbers together, and all the variables
0.2R+2500=0
We move all terms containing R to the left, all other terms to the right
0.2R=-2500
R=-2500/0.2
R=-12500
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