Dikatuhi 5(x+3)-25=3(4x-1) nilai dari x-1 adalah

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

maka,
x – 1
= -1 – 1
= -2