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-2(21+7)=0
We simplify the equation to the form, which is simple to understand
-2(21+7)=0
Simplifying terms in parentheses
-2*(+28)=0
Reorder the terms in parentheses
+(-56)=0
Remove unnecessary parentheses
-56=0
We move all terms containing to the left and all other terms to the right.
0=0+56
We simplify left and right side of the equation.
0=+56
0=56
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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