12e − 5f − 7e +3f.

To simplify the expression 12e - 5f - 7e + 3f, we can combine like terms.

First, we combine the e terms: 12e - 7e = 5e.

Next, we combine the f terms: -5f + 3f = -2f.

Putting it all together, the simplified expression is 5e - 2f.

To simplify the expression 12e - 5f - 7e + 3f, you can combine like terms.

Step 1: Combine the terms with the same variable, "e":
12e - 7e = 5e

Step 2: Combine the terms with the same variable, "f":
-5f + 3f = -2f

Putting it all together, the simplified expression is:
5e - 2f

To simplify the expression 12e - 5f - 7e + 3f, we can combine like terms.

First, let's combine the terms with "e". We have 12e - 7e, which simplifies to 5e.

Next, let's combine the terms with "f". We have -5f + 3f, which simplifies to -2f.

Putting it all together, our simplified expression is 5e - 2f.