Ok.
Switch the problem so it could look like this:
$$19-14=b$$
Now, subtract.
$$19-14=5$$
Now, change the problem back to its original form:
$$14-5=19$$
Because the postive 5 making the statement false, put the negative symbol behing the 5.
$$-{\mathtt{5}}$$
Now, put the equation with -5.
$$14-(-5)=19$$
So, $$\boxed{b=-5}$$.
There is another way to solve this. if you are confused, just ask, and I will give an easier explanation.
