Question

solve this 3x+3(x+1)+3(x+2)=999

Answer 1

The answer is in the attachment above.
Answer is 110.

Answer 2

3x+3×x+3×1+3×x+3×2=999
3x+3x+3+3x+6=999
9x+9=999
9x=999-9
9x=990
x=990/9
x=110