# Coffee

Coffee from the machine in the cup cost 28 cents. Coffee is 20 cents more expensive than the cup.

How much is the cup?

Correct result:

x =  4 cent

#### Solution:

$(20+x)+x = 28 \ \\ 20 + 2x = 28 \ \\ \ \\ x = (28-20)/2 \ \\ x = 4 \ \text{cent}$

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