3(x-9)=-3
3x-27=-3
3x=24
X=8
Check: 3(8-9)=-3
So your number is 8

in case you wonder why we used 105 as LCD,
21 = 3 * 7
15 = 3 * 5
the "3" is common to both denominators, so we "use it once" and our LCD is then 3 * 7 * 5.
Answer:
NICE
Step-by-step explanation: