The normal way to write z times 19 in an algebraic expression is 19z.
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The algebraic expression for the quotient of 3 and the sum of z and 5 is 3 / (z + 5). In this expression, the numerator is 3, and the denominator is the sum of z and 5. This expression represents dividing 3 by the sum of z and 5.
x = 7z/100
Twenty three fewer than a variable represented by z.
3q + 2z, although it could be 2*(3q+z)
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.