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33=12r-3(9-r)5
We move all terms to the left:
33-(12r-3(9-r)5)=0
We add all the numbers together, and all the variables
-(12r-3(-1r+9)5)+33=0
We calculate terms in parentheses: -(12r-3(-1r+9)5), so:We get rid of parentheses
12r-3(-1r+9)5
We multiply parentheses
12r+15r-135
We add all the numbers together, and all the variables
27r-135
Back to the equation:
-(27r-135)
-27r+135+33=0
We add all the numbers together, and all the variables
-27r+168=0
We move all terms containing r to the left, all other terms to the right
-27r=-168
r=-168/-27
r=6+2/9
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