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12z-9-10z+3-8z=z-9+3z+10-120z
We move all terms to the left:
12z-9-10z+3-8z-(z-9+3z+10-120z)=0
We add all the numbers together, and all the variables
12z-10z-8z-(-116z+1)-9+3=0
We add all the numbers together, and all the variables
-6z-(-116z+1)-6=0
We get rid of parentheses
-6z+116z-1-6=0
We add all the numbers together, and all the variables
110z-7=0
We move all terms containing z to the left, all other terms to the right
110z=7
z=7/110
z=7/110
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