3(x + 2) +5 = 2(x + 15), maka nilai 2(x -1) adalah

3(x+2) + 5 = 2(x + 15)
3x+6+5 = 2x+30
3x+11 = 2x+30
x =19

maka, 2(x-1) = 2(19-1) = 2(18)= 36

semoga membantu
ㅡ :)

Mapel : Matematika

3(x + 2) + 5 = 2(x + 15)
3x + 6 + 5 = 2x + 30
3x + 11 = 2x + 30
3x - 2x = 30 - 11
x = 19

maka
2(x - 1)
= 2(19 - 1)
= 2(18)
= 36