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-72=-8z+2z
We move all terms to the left:
-72-(-8z+2z)=0
We add all the numbers together, and all the variables
-(-6z)-72=0
We get rid of parentheses
6z-72=0
We move all terms containing z to the left, all other terms to the right
6z=72
z=72/6
z=12
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