15=x.x-3

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Solution for 15=x.x-3 equation: 



15=x.x-3

We move all terms to the left:

15-(x.x-3)=0

We get rid of parentheses

-x.x+3+15=0

We add all the numbers together, and all the variables

-x.x+18=0

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

-x.x=-18

x=-18/1

x=-18

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