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-3(2z-7)=18-3z+21-3z
We simplify the equation to the form, which is simple to understand
-3(2z-7)=18-3z+21-3z
Reorder the terms in parentheses
+(-6z+21)=18-3z+21-3z
Remove unnecessary parentheses
-6z+21=+18-3z+21-3z
We move all terms containing z to the left and all other terms to the right.
-6z+3z+3z=+18+21-21
We simplify left and right side of the equation.
z=+18
0=18
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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