
let the solution be 
let the solutions be a = 3, b = 1
is the equation with consistent value.
6 1/13 for sure
5 14/13 -> 79/13
79/13 to mixed number is 6 1/13
One can solve this by first using order of operations, and then combining like terms.
First is parenthesis
9x + 2x(9) - 2(9x)
Now we do the multiplication
9x + 18x - 18x
Now we combine like terms
9x