Im very-much out of practice... Almost feel guilty posting in 'Pre-University'

I'm trying to rearrange this equation for a electronic regulator,

$\displaystyle

Vout = (1.25 * ((1+R2)/R1)) + Iadj*R2

$

So that R2 is on its own. Im not sure what todo to cancel R2 on the left hand side...

$\displaystyle

R1 * ((Vout - (Iadj * R2))/1.25) - 1 = R2

$

Not sure how to use the maths tags properly.

Any help much appreciated.