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-4z-19=-z-7
We move all terms to the left:
-4z-19-(-z-7)=0
We add all the numbers together, and all the variables
-4z-(-1z-7)-19=0
We get rid of parentheses
-4z+1z+7-19=0
We add all the numbers together, and all the variables
-3z-12=0
We move all terms containing z to the left, all other terms to the right
-3z=12
z=12/-3
z=-4
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