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(21-8)-6=19
We simplify the equation to the form, which is simple to understand
(21-8)-6=19
Remove unnecessary parentheses
+13-6=19
We move all terms containing to the left and all other terms to the right.
0=+19-13+6
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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