+21 Kiran and Elena play a card game.
Every time they collect a pair of matching cards, they earn x points.
At one point in the game, Kiran has -6 points and Elena has 2 points. After Kiran collects 4 pairs and Elena collects 3 pairs, they have the same number of points.
How many points do they earn each time they collect a pair of matching cards?
Thanks!
