Diketahui f(x)%2 - 3x. Jika f(2a - 1)=23,maka nilai a adalah... A. -4 B. -3 C. 3 D. 4

f(x) = 2 - 3x
f (2a - 1) = 23

f (2a - 1) = 2 - 3(2a - 1)
23 = 2 - 6a + 3
23 = 5 - 6a
23 - 5 = -6a
18 = -6a
a = 18/-6
a = -3

F(2a-1)=2-3(2a-1)=23
=2-6a+3=23
=-6a+5=23
-6a=23-5
-6a=18
a=-3