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