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36=(2x+x)2
We move all terms to the left:
36-((2x+x)2)=0
We add all the numbers together, and all the variables
-((+3x)2)+36=0
We calculate terms in parentheses: -((+3x)2), so:We move all terms containing x to the left, all other terms to the right
(+3x)2
We multiply parentheses
6x
Back to the equation:
-(6x)
-6x=-36
x=-36/-6
x=+6
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