But to figure out the exact value, we just have to figure out when this line is equal to negative 2. So we have negative 2x plus 3 is equal to negative 2. And remember, this is what f of x is equal to over the interval that we care about. If we were talking about f of x over there, we wouldn't be able to put negative 2x plus 3. We'd have to have some form of equation for these circles. But right over here, this is what f of x is, and now we can solve this pretty straightforwardly. So we could subtract 3 from both sides.