diketahui f(x)= 2x-7 dan g(x)=4-3x jika (g°f)(a)=7 nilai a=

g(x) = 4 - 3x
f(x) = 2x - 7

(g°f)(a) = 4 - 3(2a - 7) = 7
4 - 6a + 21 = 7
-6a + 25 = 7
-6a = 7 - 25 = -18
a = -18/-6
a = 3