6z+21=4z+-9

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Solution for 6z+21=4z+-9 equation: 



6z+21=4z+-9

We move all terms to the left:

6z+21-(4z+-9)=0

We add all the numbers together, and all the variables

6z-(4z-9)+21=0

We get rid of parentheses

6z-4z+9+21=0

We add all the numbers together, and all the variables

2z+30=0

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

2z=-30

z=-30/2

z=-15

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