90-z+2z+z=180

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Solution for 90-z+2z+z=180 equation: 



90-z+2z+z=180

We move all terms to the left:

90-z+2z+z-(180)=0

We add all the numbers together, and all the variables

2z-90=0

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

2z=90

z=90/2

z=45

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