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-4z-20=-z-13z+20
We move all terms to the left:
-4z-20-(-z-13z+20)=0
We add all the numbers together, and all the variables
-4z-(-14z+20)-20=0
We get rid of parentheses
-4z+14z-20-20=0
We add all the numbers together, and all the variables
10z-40=0
We move all terms containing z to the left, all other terms to the right
10z=40
z=40/10
z=4
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