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T(1)=4+3=7
T(9)=4+3(9)=31
T(-1) = d - c
1 = d - c
T(1) = d + c
7 = d + c
eliminasi :
d + c = 7
d - c = 1
_________ -
2c = 6
c = 3
subtitusi :
d - c = 1
d -3 = 1
d = 1+3
d = 4
T(9) = d + 9c
= 4 + 9(3)
= 4 + 27
= 31
maaf kalo salah