3=7+z

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Solution for 3=7+z equation: 



3=7+z

We move all terms to the left:

3-(7+z)=0

We add all the numbers together, and all the variables

-(z+7)+3=0

We get rid of parentheses

-z-7+3=0

We add all the numbers together, and all the variables

-1z-4=0

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

-z=4

z=4/-1

z=-4

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