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20+z+10+180-(3z-16)=180
We move all terms to the left:
20+z+10+180-(3z-16)-(180)=0
We add all the numbers together, and all the variables
z-(3z-16)+30=0
We get rid of parentheses
z-3z+16+30=0
We add all the numbers together, and all the variables
-2z+46=0
We move all terms containing z to the left, all other terms to the right
-2z=-46
z=-46/-2
z=+23
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