3+9r2^=9

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Solution for 3+9r2^=9 equation: 



3+9r^2^=9

We move all terms to the left:

3+9r^2^-(9)=0

We add all the numbers together, and all the variables

9r^2^-6=0

We move all terms containing r to the left, all other terms to the right

9r^2^=6

r=6/1

r=6

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