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15-39-12-(-19)=0
We simplify the equation to the form, which is simple to understand
15-39-12-(-19)=0
Remove unnecessary parentheses
15-39-12+19=0
We move all terms containing to the left and all other terms to the right.
0=0-15+39+12-19
We simplify left and right side of the equation.
0=+17
0=17
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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