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20-x*2=250
We simplify the equation to the form, which is simple to understand
20-x*2=250
We move all terms containing x to the left and all other terms to the right.
-2x=+250-20
We simplify left and right side of the equation.
-2x=+230
We divide both sides of the equation by -2 to get x.
x=-115
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