(z+30)+z=90

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Solution for (z+30)+z=90 equation: 



(z+30)+z=90

We move all terms to the left:

(z+30)+z-(90)=0

We add all the numbers together, and all the variables

z+(z+30)-90=0

We get rid of parentheses

z+z+30-90=0

We add all the numbers together, and all the variables

2z-60=0

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

2z=60

z=60/2

z=30

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