tolong pake cara yg dilingkarin besok dikumpulin

3(5x + 7) = 9x - 15
15x + 21 = 9x - 15
15x - 9x = -15 - 21
6x = -36
x = -36/6
x = -6

1/2(8x - 4) = 2/3(3x + 6)
4x - 2 = 2x + 4
4x - 2x = 4 + 2
2x = 6
x = 6/2
x = 3

Semoga membantu.