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Answered by **D3xt3R**

I'm sorry about my bad english, but I'll try to help you, OK?!first we need to attribute a name to the variable, let's calleach number means the price...we know that all group are formed by kids and adults, so...now we need more one equation, but we can see... "There were 6 fewer adults than kids in the group."translating...then...now we can replace the second row at first rownow we replace the value that we found...

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