Set up an equation (part + part = whole). Solve the equation to find the value of x. 10 + x + x + 20 = 12

x is equal to -9 thus it becomes -18 in the whole setup

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

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step-by-step explanation: