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18z+8=3z-12+19z
We move all terms to the left:
18z+8-(3z-12+19z)=0
We add all the numbers together, and all the variables
18z-(22z-12)+8=0
We get rid of parentheses
18z-22z+12+8=0
We add all the numbers together, and all the variables
-4z+20=0
We move all terms containing z to the left, all other terms to the right
-4z=-20
z=-20/-4
z=+5
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