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3213=51000r*9/12
We move all terms to the left:
3213-(51000r*9/12)=0
We add all the numbers together, and all the variables
-(+51000r*9/12)+3213=0
We get rid of parentheses
-51000r*9/12+3213=0
We multiply all the terms by the denominator
-51000r*9+3213*12=0
We add all the numbers together, and all the variables
-51000r*9+38556=0
Wy multiply elements
-459000r+38556=0
We move all terms containing r to the left, all other terms to the right
-459000r=-38556
r=-38556/-459000
r=21/250
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