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5 tahun yang akan datang : I +5 dan T+5
pers 1 : I-10 = 2 (T-10) ----> I-10 = 2T-20
I-2T = -10 ...pers 3
pers 2 : I+5 = 3/2 (T+5) ---> 2I+10 = 3T+15
2I - 3T = 5 ..pers 4
pers 3 : I -2T = -10 x 3 ---> 3I - 6T = -30
pers 4 : 2I - 3T =5 x 2 ----->4I - 6T = 10
------------------- -
- I = -40
I = 40 tahun