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(7)+(-1)+(-9)=0
We simplify the equation to the form, which is simple to understand
(7)+(-1)+(-9)=0
Remove unnecessary parentheses
7+(-1)+(-9)=0
Remove unnecessary parentheses
+7-1+(-9+)=0
Remove unnecessary parentheses
+7-1-9=0
We move all terms containing to the left and all other terms to the right.
0=0-7+1+9
We simplify left and right side of the equation.
0=+3
0=3
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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