x=3^2-7^2

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Solution for x=3^2-7^2 equation: 



x=3^2-7^2

We move all terms to the left:

x-(3^2-7^2)=0

We add all the numbers together, and all the variables

x+40=0

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

x=-40

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