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X.2+(X+6)2=90
We move all terms to the left:
X.2+(X+6)2-(90)=0
We multiply parentheses
X.2+2X+12-90=0
We add all the numbers together, and all the variables
2X+X.2-78=0
We move all terms containing X to the left, all other terms to the right
2X+X.2=78
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