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W = winda
R - 6 = 2/3 (W - 6)
3R - 18 = 2W - 12
3R = 2W + 6 => 2W = 3R - 6
R + 2 = 4/5 (W + 2)
5R + 10 = 4W + 8
5R + 10 = 2(3R - 6) + 8
5R + 10 = 6R - 12 + 8
14 tahun= R
2W = 3(14) - 6
2W = 42 - 6
2W = 36
W = 18 tahun