Can you please help me with the steps to getting this answer?

How do we get from:

-c + dP = a - bP

To P= (a+c)/(b+d)

Could you please answer with as many details as possible for each step. Thank you!

If it helps, here is the full question:

Consider a market with the quantity demanded d, the quantity supplied s, and its price .

The relation between the variables are given as: d = and s = - + .

a) Find the equilibrium values of d, s and P

Hint: An equilibrium price can be found by setting quantity demanded equal to quantity supplied.