90+(90-z)+X=180

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Solution for 90+(90-z)+X=180 equation: 



90+(90-z)+z=180

We move all terms to the left:

90+(90-z)+z-(180)=0

We add all the numbers together, and all the variables

(-1z+90)+z+90-180=0

We add all the numbers together, and all the variables

z+(-1z+90)-90=0

We get rid of parentheses

z-1z+90-90=0

We add all the numbers together, and all the variables

=0

z=0/1

z=0

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