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x'2-8x-20=0
We simplify the equation to the form, which is simple to understand
x'2-8x-20=0
We move all terms containing x to the left and all other terms to the right.
+1x-8x=0+20
We simplify left and right side of the equation.
-7x=+20
We divide both sides of the equation by -7 to get x.
x=-2.85714285714
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