21=0.8-z

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Solution for 21=0.8-z equation:


21=0.8-z

We simplify the equation to the form, which is simple to understand 
21=0.8-z

We move all terms containing z to the left and all other terms to the right. 
+1z=0.8-21

We simplify left and right side of the equation. 
+1z=-20.2

We divide both sides of the equation by 01 to get z. 
z=-20.2

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