21=-3(23-z)+3(z-2)

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Solution for 21=-3(23-z)+3(z-2) equation:


21=-3(23-z)+3(z-2)

We simplify the equation to the form, which is simple to understand 
21=-3(23-z)+3(z-2)

Reorder the terms in parentheses
21=+(-69+3z)+3*(z-2)

Remove unnecessary parentheses
+21=-69+3z+3+*(+z-2+)

Reorder the terms in parentheses
21=-69+3z+(+3z-6)

Remove unnecessary parentheses
+21=-69+3z+3z-6

We move all terms containing z to the left and all other terms to the right. 
-3z-3z=-69-6-21

We simplify left and right side of the equation. 
-6z=-96

We divide both sides of the equation by -6 to get z. 
z=16

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