Answer:
f + 12e
Step-by-step explanation
(+2f) + (+9e) + (-f) + (+3e)
(2f) + (-f) = 1f or f
9e + 3e = 12e
12e + f
Explanation:
2f - f = f
9e + 3e = 12
....
5.1m questions
6.7m answers