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-400x+4000=0
We simplify the equation to the form, which is simple to understand
-400x+4000=0
We move all terms containing x to the left and all other terms to the right.
-400x=0-4000
We simplify left and right side of the equation.
-400x=-4000
We divide both sides of the equation by -400 to get x.
x=10
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