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3x = 18
x = 6
Maka;
5x - 6 = 5(6) - 6 = 30 - 6 = 24
2x + 12 = 2(6) + 12 = 12 + 12 = 24
Karena, sisi sisi belah ketupat sama, maka;
Panjang MN = 24 cm