3) -7x - 3x + 2 = -8x - 8

Prove that the sum of two consecutive exponents of the number 5 is divisible by 30.if two consecutive exponents are 5n and 5n + 1, then their sum can be written as 30.

How do i do this activity, is appreciated

The vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation