Question

(9n + 12) ft + (15n -6) ft

Answer 1

                                              ft(9n+12)+(15n-6)ft
Regroup terms: ft(9n+12)+ft(15n-6)
Expand: 9ftn+12ft+15ftn-6ft
Collect like-terms: (9ftn+15 ftn)+(12ft-6ft)
Simplify: 24ftn+6ft

Answer 2

For this case, the first thing we must do is to group similar terms.
 We have then:
 n (9 + 15) + (12-6)
 Rewriting:
 24n - 6 ft
 Answer:
 (9n + 12) ft + (15n -6) ft = 24n - 6 ft