Let's simplify the given expression:

$B = (-9) + (10) - (+3) - (+7) + (-4)$

Step-by-step calculation:

1. $-9 + 10 = 1$
2. $1 - 3 = -2$
3. $-2 - 7 = -9$
4. $-9 + (-4) = -13$

So, the value of $B$ is:

$B = -13$

Would you like further details or have any questions? Here are some related problems to try:

1. $B = (-5) + (12) - (+4) + (-3) + (-6)$
2. $C = (-15) + (20) - (+8) + (-5) + (-7)$
3. Simplify $D = (8) + (-3) - (+6) - (+1) + (4)$
4. Evaluate $E = (-10) + (5) - (-3) + (-8) - (+2)$
5. Calculate $F = (-7) + (14) - (+9) - (+5) + (2)$

Tip: Always combine positive and negative terms carefully by treating subtraction as adding the negative!