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12+11+3z+z-1+2z+3=67
We move all terms to the left:
12+11+3z+z-1+2z+3-(67)=0
We add all the numbers together, and all the variables
6z-42=0
We move all terms containing z to the left, all other terms to the right
6z=42
z=42/6
z=7
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