x.x+9=21

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Solution for x.x+9=21 equation: 



x.x+9=21

We move all terms to the left:

x.x+9-(21)=0

We add all the numbers together, and all the variables

x.x-12=0

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

x.x=12

x=12/1

x=12

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