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-90z-0.4=-100z+1.2
We move all terms to the left:
-90z-0.4-(-100z+1.2)=0
We get rid of parentheses
-90z+100z-1.2-0.4=0
We add all the numbers together, and all the variables
10z-1.6=0
We move all terms containing z to the left, all other terms to the right
10z=1.6
z=1.6/10
z=1/6.25
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