Question

A={x/x € N;10 <3x+2<18}

Answer 1

10 < 3x+2 < 18

10-2 < 3x < 18 - 2

8/3 < x < 16/3

 2,66 < x < 5,33   ----- > x = 3,4,5   


Espero te sirva :D