Question

   5x-3<igual 2x+12..........................

Answer 1

5x-3<igual 2x+12....

5x - 3 ≤ 2x + 12

5x - 2x -3 ≤ +12
5x - 2x ≤12 + 3
3x  ≤ 15
x ≤15/3

x ≤ 5
                     5
/\/\/\/\/\/\/\/\/\/\O-------------------------->.

            bolinha preta( bolinha fechada) porque entra o 5 (≤)

V = {x ∈ R| x ≤ 5} 

Answer 2

5x - 3 ≤ 2x + 12
5x - 2x ≤ 12 + 3
3x ≤ 15
x ≤ 15/3
x ≤ 5