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4+(-3)+(-9)=0
We simplify the equation to the form, which is simple to understand
4+(-3)+(-9)=0
Remove unnecessary parentheses
+4-3+(-9+)=0
Remove unnecessary parentheses
+4-3-9=0
We move all terms containing to the left and all other terms to the right.
0=0-4+3+9
We simplify left and right side of the equation.
0=+8
0=8
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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