27=18-x.x

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Solution for 27=18-x.x equation: 



27=18-x.x

We move all terms to the left:

27-(18-x.x)=0

We add all the numbers together, and all the variables

-(-x.x+18)+27=0

We get rid of parentheses

x.x-18+27=0

We add all the numbers together, and all the variables

x.x+9=0

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

x.x=-9

x=-9/1

x=-9

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