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1800=10000r*4
We move all terms to the left:
1800-(10000r*4)=0
We add all the numbers together, and all the variables
-(+10000r*4)+1800=0
We get rid of parentheses
-10000r*4+1800=0
Wy multiply elements
-40000r+1800=0
We move all terms containing r to the left, all other terms to the right
-40000r=-1800
r=-1800/-40000
r=9/200
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