dik 5(x+3)-25=3(4x-1),nilai dari x-1

jawabannya di gambar,,

5(x + 3) - 25 = 3(4x - 1)
5x + 15 - 25 = 12x - 3
5x - 10 = 12x - 3
5x - 12x = -3 + 10
-7x = 7
x = -1

x - 1 = -1 - 1 = -2

semoga membantu ^^