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-2+18+20=-19+z
We move all terms to the left:
-2+18+20-(-19+z)=0
We add all the numbers together, and all the variables
-(z-19)-2+18+20=0
We add all the numbers together, and all the variables
-(z-19)+36=0
We get rid of parentheses
-z+19+36=0
We add all the numbers together, and all the variables
-1z+55=0
We move all terms containing z to the left, all other terms to the right
-z=-55
z=-55/-1
z=+55
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