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0=r+100/9
We move all terms to the left:
0-(r+100/9)=0
We add all the numbers together, and all the variables
-(+r+100/9)+0=0
We add all the numbers together, and all the variables
-(+r+100/9)=0
We get rid of parentheses
-r-100/9=0
We multiply all the terms by the denominator
-r*9-100=0
Wy multiply elements
-9r-100=0
We move all terms containing r to the left, all other terms to the right
-9r=100
r=100/-9
r=-11+1/9
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