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(-12)-15=0
We simplify the equation to the form, which is simple to understand
(-12)-15=0
Remove unnecessary parentheses
-12-15=0
We move all terms containing to the left and all other terms to the right.
0=0+12+15
We simplify left and right side of the equation.
0=+27
0=27
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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