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21x-x*x=104
We simplify the equation to the form, which is simple to understand
21x-x*x=104
We move all terms containing x to the left and all other terms to the right.
+1x=+104
We simplify left and right side of the equation.
+1x=+104
We divide both sides of the equation by 1 to get x.
x=104
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