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x*x-5x-9=0
We simplify the equation to the form, which is simple to understand
x*x-5x-9=0
We move all terms containing x to the left and all other terms to the right.
+1x-5x=0+9
We simplify left and right side of the equation.
-4x=+9
We divide both sides of the equation by -4 to get x.
x=-2.25
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