Answer :
combine like terms
3f - 5g - f - 2g...lets do some rearranging to make it easier
3f - f - 5g - 2g =
2f - 7g <===
3f - 5g - f - 2g...lets do some rearranging to make it easier
3f - f - 5g - 2g =
2f - 7g <===