What is four times a number b which is 3 more than h ?

$4 b = 3 + h$
You can't deduce exact values for $b$ and $h$, so I assume you're asking for the formula described by the sentence.
The only thing we know is that four times $b$, i.e. $4 b$, is $3$ more than $h$. Translate "$3$ more than $h$" with $h + 3$, and "is" with $=$ to get
$4 b = 3 + h$