z+3z+21=5

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Solution for z+3z+21=5 equation: 



z+3z+21=5

We move all terms to the left:

z+3z+21-(5)=0

We add all the numbers together, and all the variables

4z+16=0

We move all terms containing z to the left, all other terms to the right

4z=-16

z=-16/4

z=-4

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