We know the complete set u = {2,3, a & sup2; + 2a-3}, a = {| a + 7 |, 2}, CUA = {5}, how to find the value of a? Given the complete set u = {2,3, a & sup2; + 2a-3}, a = {a + 7}, 2}, CUA = {5}, find the value of a? It will be added~~~~~~~~~~~~~~~~~~~~ How does a & sup2; + 2a-3 = 5 come from? At the end of the elimination, there is only a & sup2; + 2a-3 left. How can it be equal to 5??? How did you get it??? It's urgent! 】 But two and three are already five A & sup2; + 2a-3 should be zero

We know the complete set u = {2,3, a & sup2; + 2a-3}, a = {| a + 7 |, 2}, CUA = {5}, how to find the value of a? Given the complete set u = {2,3, a & sup2; + 2a-3}, a = {a + 7}, 2}, CUA = {5}, find the value of a? It will be added~~~~~~~~~~~~~~~~~~~~ How does a & sup2; + 2a-3 = 5 come from? At the end of the elimination, there is only a & sup2; + 2a-3 left. How can it be equal to 5??? How did you get it??? It's urgent! 】 But two and three are already five A & sup2; + 2a-3 should be zero

A & sup2; + 2a-3 = 5, so a = 2 or a = - 4
Test: when a = 2, a = {9,2}, u = {2,3,5} (inconsistent, rounding off)
When a = - 4, a = {3,2}, u = {2,3,5} (consistent)
To sum up: a = - 4