How many solutions does the equation have?

6 - a = 1/3 (9a - 18)

a.
one solution

b.
infinite solutions

c.
no solution

do you mean add both of the equations together

because if you do the answer is 10x-5

step-by-step explanation:

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads