x.x-2=120

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Solution for x.x-2=120 equation: 



x.x-2=120

We move all terms to the left:

x.x-2-(120)=0

We add all the numbers together, and all the variables

x.x-122=0

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

x.x=122

x=122/1

x=122

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