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15-(-15)=0
We simplify the equation to the form, which is simple to understand
15-(-15)=0
Remove unnecessary parentheses
15+15=0
We move all terms containing to the left and all other terms to the right.
0=0-15-15
We simplify left and right side of the equation.
0=-30
0=-30
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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