Question

x+8x =18
----------
3

Answer 1

vamos lá:
some primeiro:
x+8x= 9x
9x = 18
x= 18:9
x= 2
x= 2/3
bons estudos

Answer 2

x+8x=18
-------
  3

9x=18
----
3

3x=18

x=18
    ---
     3

x=6