suatu fungsi dinyatakan dengan rumus f(x)=3x-1. jika f(a+1)=14 maka nilai a adalah tolong yaa

f(x) = 3x -1
f(a +1) = 3( a+1) - 1 =14
3a +3 - 1 = 14
3a = 14 - 2
a = 12/3
a= 4

F(x) = 3x - 1
F(a + 1) = 14
→ 14 = 3(a + 1) - 1
→14 = 3a + 3 -1
→ 14 = 3a + 2
→ 14 - 2 = 3a
→ 12 = 3a
→ a = 12/3
→ a = 4