Solve for z
z=3
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7z-3=18
Add 12 and 6 to get 18.
7z=18+3
Add 3 to both sides.
7z=21
Add 18 and 3 to get 21.
z=\frac{21}{7}
Divide both sides by 7.
z=3
Divide 21 by 7 to get 3.
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