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-5-(-4)+21=0
We simplify the equation to the form, which is simple to understand
-5-(-4)+21=0
Remove unnecessary parentheses
-5+4+21=0
We move all terms containing to the left and all other terms to the right.
0=0+5-4-21
We simplify left and right side of the equation.
0=-20
0=-20
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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