3z+21-z=

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Solution for 3z+21-z= equation:


3z+21-z=0

We simplify the equation to the form, which is simple to understand 
3z+21-z=0

We move all terms containing z to the left and all other terms to the right. 
+3z-1z=0-21

We simplify left and right side of the equation. 
+2z=-21

We divide both sides of the equation by 2 to get z. 
z=-10.5

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