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-10z-0.7=-20z+2.5
We move all terms to the left:
-10z-0.7-(-20z+2.5)=0
We get rid of parentheses
-10z+20z-2.5-0.7=0
We add all the numbers together, and all the variables
10z-3.2=0
We move all terms containing z to the left, all other terms to the right
10z=3.2
z=3.2/10
z=2.6666666666667/8.3333333333333
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