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-80z-0.8=-90z+1.3
We move all terms to the left:
-80z-0.8-(-90z+1.3)=0
We get rid of parentheses
-80z+90z-1.3-0.8=0
We add all the numbers together, and all the variables
10z-2.1=0
We move all terms containing z to the left, all other terms to the right
10z=2.1
z=2.1/10
z=1/4.7619047619
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