Nine zeros in one billion.
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(z-9)(z+3
It's rare to see an equation with two equals signs. I'm guessing something else went in between 3z and 9. 3z + 9 = 15, then z = 2 3z - 9 = 15, then z = 8 3z x 9 = 15, then z = 5/9 3z/9 = 15, then z = 45
If you mean z-9=3, then z=12. That means you can make any algebraic expression that makes sense. e.g. z+1=13.
-3
9 digits in a zip code