Simplify: (7a - 9c) - (-12a - 33c) - (-21a + 10c)

The answer is 40a+14c

Step-by-step explanation:

Step 1: Open the brackets

7a-9c+12a+33c+21a-10c

Step 2: Group all the like terms

Like terms are terms with similar variables, for example;

(7a, 12a, 21a) are all like terms since they have a common variable (a)

(-9c, 33c,-10c) are also like terms since they have a common variable (c)

Step 2: Solve

(7a+12a+21a) + (33c-10c-9c) = 40a+14c

The answer is 40a+14c