9=4z+-7

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Solution for 9=4z+-7 equation: 



9=4z+-7

We move all terms to the left:

9-(4z+-7)=0

We add all the numbers together, and all the variables

-(4z-7)+9=0

We get rid of parentheses

-4z+7+9=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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