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17=7z+3
We move all terms to the left:
17-(7z+3)=0
We get rid of parentheses
-7z-3+17=0
We add all the numbers together, and all the variables
-7z+14=0
We move all terms containing z to the left, all other terms to the right
-7z=-14
z=-14/-7
z=+2
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