10x + 6 = 7x - 18 tentukan nilai 3x-2

10x+6=7x-18
6-18=7x-10x
-12=-3x
12=3x
4=x
________________
3x-2=3x4-2
12-2=10

Pembahasan

1. Cari x
10x + 6 = 7x - 18
Variabel = Konstanta
10x - 7x = - 18 - 6
3x = -24
x = -8

2. Subtitusi x = -8 ke 3x - 2
3x - 2
= 3(-8) - 2
= -24 - 2
= -26