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z+(z+80)=180
We move all terms to the left:
z+(z+80)-(180)=0
We get rid of parentheses
z+z+80-180=0
We add all the numbers together, and all the variables
2z-100=0
We move all terms containing z to the left, all other terms to the right
2z=100
z=100/2
z=50
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