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17=2x-3
x=10
f(17)=40-7 =33
f(7)=28-7=21
33-21=12
2x - 3 = 17
2x= 17 + 3
2x = 20
x = 10
f (7)
2x - 3 = 7
2x = 7 +3
2x=10
x= 5
sehingga f(17) = 4x - 7 = 4.(10) - 7 =40 - 7 = 33
sehingga f(7) = 4x - 7 = 4(5) -7 = 20 -7 = 13 :)