I am very stuck on this, any hints would be very helpful.
$\displaystyle sinx + \frac{2}{\pi}x -2 = 0$
Solve for $\displaystyle x$.
You can't normally solve an equation like this, other than by a numerical or a graphical method. However, this one is a bit 'sneaky'. Look at what happens if you put $\displaystyle x = \pi$.