Is 5f + 4 - 3f - 2 = 2f - 2

Combine like terms on left side:

(5f-3f) + (4-2) = 2f-2

2f+2=2f-2 subtract 2 from both sides

2f=2f-4 subtract 2f from both sides

0=-4

Since the above in not true,

5f+4-3f-2 does not equal 2f-2 for any value of f ...