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-3z+8=2z-12=
We move all terms to the left:
-3z+8-(2z-12)=0
We get rid of parentheses
-3z-2z+12+8=0
We add all the numbers together, and all the variables
-5z+20=0
We move all terms containing z to the left, all other terms to the right
-5z=-20
z=-20/-5
z=+4
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