Answer: 4 1/4
5 1/2 – x = 1 1/4
-5 1/2 -5 1/2
────────
–x = -4 1/4
Divide both sides by -1
x = 4 1/4
They used 4 1/4 water gallons to water the pepper plant,
Also 4 1/4 is kinda weirdly typed, so I attached a picture of how it should be written :
Hope this helped =)