Cammy wrote the expression 8a + 6(b - 2a). Fred wrote an expression equivalent to Cammy. Which expression could Fred have written?

Use the distributive property:

8a + 6(b - 2a)

=  8a + 6(b) - 6(2a)

=  8a + 6b - 12a

=                                        <---   Finish this to get the answer!