21=-2z+7z

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Solution for 21=-2z+7z equation:


21=-2z+7z

We simplify the equation to the form, which is simple to understand 
21=-2z+7z

We move all terms containing z to the left and all other terms to the right. 
+2z-7z=-21

We simplify left and right side of the equation. 
-5z=-21

We divide both sides of the equation by -5 to get z. 
z=4.2

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