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2x + 3x = 45
5x = 45
x = 9
2/3 x 9 = 6 (D)
(A + 6 ) + (B +6 ) = 42
A + B + 12 = 42
A + B = 30
2/3B +3/3B = 30
5/3B = 30
B = 90/5 = 18
A = 2/3B
= 2/3 x 18
= 12
B - a = 18 - 12 = 6 Tahun ...d