What is a Function? - Definition & Examples

The arrow $\mapsto$ represents the "process" of the function $f$. The process starts with $93$ and produces $3$.

$x=3$ is the unique solution to the equation $f(x) = 93$.

Multiplying $3$ by a number $f$ gives an answer of $93$.

Starting with $3$, the number on the left, the "machine" $x\mapsto{f}$ produces $93$, the number on the right.