Write an expression that is equivalent to

(23.6-7.1a-4.2b) - (5.8b-9a)

Let's simplify step-by-step. 23.6 - 7.1a - 4.2b - (5.8b - 9a) Distribute the Negative Sign: = 23.6 - 7.1a - 4.2b + - 1 (5.8b - 9a) = 23.6 + - 7.1a + - 4.2b + - 1 (5.8b) + - 1 ( - 9a) = 23.6 + - 7.1a + - 4.2b + - 5.8b + 9a Combine Like Terms: = 23.6 + - 7.1a + - 4.2b + - 5.8b + 9a = ( - 7.1a + 9a) + ( - 4.2b + - 5.8b) + (23.6) = 1.9a + - 10b + 23.6