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(5+2)^2=x
We move all terms to the left:
(5+2)^2-(x)=0
We add all the numbers together, and all the variables
-x+7^2=0
We add all the numbers together, and all the variables
-1x+49=0
We move all terms containing x to the left, all other terms to the right
-x=-49
x=-49/-1
x=+49
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