Use the following property of equations to solve the given equation.
Let a, b and c be real numbers, such that c is different from 0. Then:

On the given equation:

Divide both sides of the equation by 7 (as the property says):

Simplify the fraction 7p/7:

Divide -63 by 7. Since -63 is negative and 7 is positive, the result should be negative. Additionally, 63/7 = 9, so:

Therefore, the solution for the equation 7p=-63 is p=-9.