(3*3)+(9*9)=c

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Solution for (3*3)+(9*9)=c equation: 



(3*3)+(9*9)=c

We move all terms to the left:

(3*3)+(9*9)-(c)=0

We add all the numbers together, and all the variables

-c+9+81=0

We add all the numbers together, and all the variables

-1c+90=0

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

-c=-90

c=-90/-1

c=+90

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