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(2z+5)+(4z-5)=180
We move all terms to the left:
(2z+5)+(4z-5)-(180)=0
We get rid of parentheses
2z+4z+5-5-180=0
We add all the numbers together, and all the variables
6z-180=0
We move all terms containing z to the left, all other terms to the right
6z=180
z=180/6
z=30
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