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4x16 dm= -__
7
panjang sisi papan 2 = y
selisih -----> x - y = 16
x = 16 + y
3 / (7 - 3) = x / 16
3 / 4 = x / 16
x = 12
7 / (7 - 3) = y / 16
7 / 4 =y / 16
y = 112