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-x+(-2x)=0
We simplify the equation to the form, which is simple to understand
-x+(-2x)=0
Remove unnecessary parentheses
-x-2x=0
We move all terms containing x to the left and all other terms to the right.
-1x-2x=0
We simplify left and right side of the equation.
-3x=0
We divide both sides of the equation by -3 to get x.
x=-0
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