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3x + 7x = 10x = Rp2.000.000,00.
x = 2.000.000/10 = 200.000.
7 - 3 = 4x = 4(200.000) = Rp800.000,00.
2.
14km = 1.400.000cm.
Skala = Js : Jp.
Skala = 1.400.000 : 7.
Skala = 1:200.000.