Question

If 5 4, − = x then x =
A. −21
B. −11
C. 1
D. 11

Answer 1

5 - x = 4
Subtract x from both sides.
5 - x + x = 4 + x
5 = 4 + x
Subtract 4 from both sides.
5 - 4 = 4 + x - 4
Hence, the answer:

x = 1