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EF = GH (sisi belah ketupat sama panjang)
5x - 3 = 2x + 3
5x - 2x = 3 + 3
3x = 6
x = 2
EF = 5x - 3 = 10-3 = 7
GH = 2x + 3 = 4 + 3 = 7