Hey /sci/, not a long time lurker here, and new-ish to the world of mathematics.
Someone asked me to solve
9x-7i>3(3x-7u)
And she said the answer was i<3u, but isn’t that wrong?
9x-7i>3(3x-7u)
9x-7(?-1)>9x-21u
(This is where I get a little lost)
-(-7)>-(-21u^2)
? 7>21u
u= ?7/21?
How do I tell this bitch she’s wrong, she keeps saying it’s a joke and I’m not confident enough in my math skills to prove her