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(x*x)-2x-4=0
We simplify the equation to the form, which is simple to understand
(x*x)-2x-4=0
Remove unnecessary parentheses
*x-2x-4=0
We move all terms containing x to the left and all other terms to the right.
+1x-2x=0+4
We simplify left and right side of the equation.
-1x=+4
We divide both sides of the equation by -1 to get x.
x=-4
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