Persamaan 4x+6=7x-12,maka nilai 2x-9 adalah

4x+6=7x-12
6+12=7x-4x
18 = 3x
x = 18/3
x = 6

jadi nilai 2x-9 = 2 x 6 – 9
12 – 9 = 3

semoga membantu

4x+6 = 7x-12
4x-7x = -6-12
-3x = -18
X = 6
==> 2x-9 = 2(6)-9 = 3