12-9=10-z

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Solution for 12-9=10-z equation: 



12-9=10-z

We move all terms to the left:

12-9-(10-z)=0

We add all the numbers together, and all the variables

-(-1z+10)+12-9=0

We add all the numbers together, and all the variables

-(-1z+10)+3=0

We get rid of parentheses

1z-10+3=0

We add all the numbers together, and all the variables

z-7=0

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

z=7

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