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(5-9/3)+(6+21/7)=0
We simplify the equation to the form, which is simple to understand
(5-9/3)+(6+21/7)=0
Remove unnecessary parentheses
+2+(+9)=0
Remove unnecessary parentheses
+2+9=0
We move all terms containing to the left and all other terms to the right.
0=0-2-9
We simplify left and right side of the equation.
0=-11
0=-11
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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