<u>Answer:</u>
Eric's uncle gave him 67 cards.
<u>Step-by-step explanation:</u>
We know that:
the number of baseball cards Eric had earlier = 143,
the number of cards Eric's uncle gave him = x,
the number of cards Eric gave to his friends = 26, and
the number of cards Eric is left with = 184
So before giving 26 cards to his friend, Eric had = 184 + 26 = 210
and initially he had 143 cards.
Therefore, his uncle gave him = 210 - 143 = 67 cards.
