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-15-20z=-19z
We move all terms to the left:
-15-20z-(-19z)=0
We get rid of parentheses
-20z+19z-15=0
We add all the numbers together, and all the variables
-1z-15=0
We move all terms containing z to the left, all other terms to the right
-z=15
z=15/-1
z=-15
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