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1050=3000r*7
We move all terms to the left:
1050-(3000r*7)=0
We add all the numbers together, and all the variables
-(+3000r*7)+1050=0
We get rid of parentheses
-3000r*7+1050=0
Wy multiply elements
-21000r+1050=0
We move all terms containing r to the left, all other terms to the right
-21000r=-1050
r=-1050/-21000
r=1/20
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