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180=z+30+30+30
We move all terms to the left:
180-(z+30+30+30)=0
We add all the numbers together, and all the variables
-(z+90)+180=0
We get rid of parentheses
-z-90+180=0
We add all the numbers together, and all the variables
-1z+90=0
We move all terms containing z to the left, all other terms to the right
-z=-90
z=-90/-1
z=+90
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