To simplify the fraction, we multiply the numerator and denominator by the conjugate of the denominator.
The conjugate of $-3+4i$ is $-3-4i$.
So, \[\frac{2+2i}{-3+4i}=\frac{(2+2i)(-3-4i)}{(-3+4i)(-3-4i)}=\frac{-6-8i-6i-8i^2}{9+12i-12i-16i^2}.\]
Since $i^2=-1$, we can simplify further to \[\frac{-6-8i-6i-8(-1)}{9+12i-12i-16(-1)}=\frac{-6-8i-6i+8}{9+12i-12i+16}.\]
Simplifying the numerator and denominator separately, we get \[\frac{2-14i}{25}=\frac{2}{25}-\frac{14}{25}i.\]
Therefore, the simplified form is $\boxed{\frac{2}{25}-\frac{14}{25}i}$.
The answer is: \frac{2}{25}-\frac{14}{25}i
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Find the simplified form of $\displaystyle\frac{2+2i}{-3+4i}$, expressing the answer as a complex number in the form $a+bi$, where $a$ and $b$ are real numbers.

### Answer:
