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-20=10z-15
We move all terms to the left:
-20-(10z-15)=0
We get rid of parentheses
-10z+15-20=0
We add all the numbers together, and all the variables
-10z-5=0
We move all terms containing z to the left, all other terms to the right
-10z=5
z=5/-10
z=-1/2
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