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-5-(-7)-2-(-13)=0
We simplify the equation to the form, which is simple to understand
-5-(-7)-2-(-13)=0
Remove unnecessary parentheses
-5+7-2-(-13)=0
Remove unnecessary parentheses
-5+7-2+13=0
We move all terms containing to the left and all other terms to the right.
0=0+5-7+2-13
We simplify left and right side of the equation.
0=-13
0=-13
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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