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13+(-9)/3-4=0
We simplify the equation to the form, which is simple to understand
13+(-9)/3-4=0
Reorder the terms in parentheses
13+(-3)-4=0
Remove unnecessary parentheses
+13-3-4=0
We move all terms containing to the left and all other terms to the right.
0=0-13+3+4
We simplify left and right side of the equation.
0=-6
0=-6
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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