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