Value of unknowns

Question

3f+4f-2f=125

Answer 1

3f+4f-2f=125

when you add 3f + 4f and subtract 2f, your left with 5f=125

you divided both sides by 5 and get f=25

Answer 2

Because all the terms are similar (same variable f), you can just add or subtract the numerical coefficients.

3f + 4f - 2f = 5f. so 5f = 125. Divide both sides by 5 to get the value for f. If you want to, you can check by substituting the answer in the equation.