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x*x-7x-18=0
We simplify the equation to the form, which is simple to understand
x*x-7x-18=0
We move all terms containing x to the left and all other terms to the right.
+1x-7x=0+18
We simplify left and right side of the equation.
-6x=+18
We divide both sides of the equation by -6 to get x.
x=-3
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