Question

Solve for f. show your work! 12=f-13-2

Answer 1

12=f-13-2
12=f-15
f=27

Answer 2

12 = f - 13 - 2
12 = f - 15
12 + 15 = f - 15 + 15 ... add 15 to both sides
27 = f + 0
27 = f
f = 27