Answer:
[tex]let \: unknown = x \\ then \\ x - 3 = 17 \\ x = 17 + 3 \\ x = 20 \\ thank \: you[/tex]
20
Step-by-step explanation:
17 is three less than something
that "something" is 3 more than 17
add 3 to 17
17+3= 20
