1. ## Definite Integral problem

So here's my problem:

Let $\int_0^9f(x)dx=7, \int_0^3f(x)dx=2 , \int_6^9f(x)dx=10$

Find $\int_3^6f(x)dx=$

and

$\int_6^3(7f(x)-2)dx=$

Any suggestions on how I could get started?