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(z+19)+(2z+20)+(z+9)=180
We move all terms to the left:
(z+19)+(2z+20)+(z+9)-(180)=0
We get rid of parentheses
z+2z+z+19+20+9-180=0
We add all the numbers together, and all the variables
4z-132=0
We move all terms containing z to the left, all other terms to the right
4z=132
z=132/4
z=33
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