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-15-(-4)+(-1)=0
We simplify the equation to the form, which is simple to understand
-15-(-4)+(-1)=0
Remove unnecessary parentheses
-15+4+(-1)=0
Remove unnecessary parentheses
-15+4-1=0
We move all terms containing to the left and all other terms to the right.
0=0+15-4+1
We simplify left and right side of the equation.
0=+12
0=12
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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