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Sergei G · Answer 1 · 2017-06-09T10:59:06+0000

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.

$x \ \textless \ (9-4b)/(-a)$

Final solution:

$x \ \textless \ (4b-9)/(a)$

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