X^2+12x+36=81+x^2

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Solution for X^2+12x+36=81+x^2 equation: 



X^2+12X+36=81+X^2

We move all terms to the left:

X^2+12X+36-(81+X^2)=0

We get rid of parentheses

X^2-X^2+12X-81+36=0

We add all the numbers together, and all the variables

12X-45=0

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

12X=45

X=45/12

X=3+3/4

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