Simplify the expression.
7b + 3x − 5b + 21x
A 2b − 18x2b − 18x
B 2b + 24x2b + 24x
C −2b + −18x−2b + −18x
D −2b + 24x
To simplify the expression 7b + 3x - 5b + 21x, you can combine like terms.
Combine the b terms: 7b - 5b = 2b.
Combine the x terms: 3x + 21x = 24x.
Therefore, the simplified expression is 2b + 24x.
Option B, 2b + 24x, is the correct answer.