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73=10z-7
We move all terms to the left:
73-(10z-7)=0
We get rid of parentheses
-10z+7+73=0
We add all the numbers together, and all the variables
-10z+80=0
We move all terms containing z to the left, all other terms to the right
-10z=-80
z=-80/-10
z=+8
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