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291-(-13+-8)=0
We simplify the equation to the form, which is simple to understand
291-(-13+-8)=0
Simplifying terms in parentheses
291-(+-8-13)=0
Remove unnecessary parentheses
291+13=0
We move all terms containing to the left and all other terms to the right.
0=0-291-0-13
We simplify left and right side of the equation.
0=-304
0=-304
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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