Question

Dados os conjuntos A = {2x, 1 , 4, 7} e B = {6,1,4, y + 2}, sabendo que A = B, determine x + y.

Answer 1

2x=6 x=3
1=1
4=4
7=y+2 y=5
x+y=3+5=8

Answer 2

$2x=6\\x=\frac{6}{2} \\x=3\\\\y+2=7\\y=7-2\\y=5\\\\x+y=\\3+5=8$