Question

Can u help me solve for x in this equation please?

Answer 1

To solve for x means to put x on one side, and everything else on the other side.

Let's do that:

$-ax+4b\ \textgreater \ 9$

$-ax \ \textgreater \ 9-4b$
And now we have to divide with -a.
Be careful: When dividing with anything that's negative, you have to reverse the inequality.
$x \ \textless \ \frac{9-4b}{-a}$

Final solution: 
$x \ \textless \ \frac{4b-9}{a}$