tolong dong caranya no 17 (yg paling bawah), besok uas:(, thanks before

f(3x-5)= 4x-6
3x-5= x'
3x= x'+5
x= x'+5/3
f(x) = 4((x+5)/3 - 6
f(x) = 4x+20/3 - 6
f(x) = 4x+20)3 - 18/3
f(x) = 4x+20-18 / 3
f(x) = 4x+2 / 3

f(2) = 4(2)+2 / 3 = 10/3
f(3) = 4(3)+2/ 3 = 14 /3
f(2)+f(3)= 10/3+14/3 = 24/3 = 8