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10z-40=12z/2
We move all terms to the left:
10z-40-(12z/2)=0
We add all the numbers together, and all the variables
10z-(+12z/2)-40=0
We get rid of parentheses
10z-12z/2-40=0
We multiply all the terms by the denominator
10z*2-12z-40*2=0
We add all the numbers together, and all the variables
-12z+10z*2-80=0
Wy multiply elements
-12z+20z-80=0
We add all the numbers together, and all the variables
8z-80=0
We move all terms containing z to the left, all other terms to the right
8z=80
z=80/8
z=10
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