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3X - 2X = X
2X + 3X = 5X
70 = 5X
14 = X
Selisih = 14 kelereng
fajar = F
B : F = 2 :3
B = 2/3 F F = 3/2 B
B + F = 70
2/3F + F = 70
5/3 F = 70
5F = 210
F = 42
B = 2/3 F
= 2/3 x 42
= 14
Selisih
F - B = 42 - 14
= 28