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EF = GH
5x -3 = 2x + 3
5x - 2x -3 + 3 = 2x - 2x + 3 + 3
3x = 6
x = 6 : 3
x = 2
maka sisinya
2x + 3 = 2(2) + 3 = 7 cm
buktikan lagi
5x - 3 = 5(2) - 3 = 10 - 3 = 7 cm