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2x + 3 = 5x - 3
2x - 2x + 3 + 3 = 5x - 2x -3 + 3
6 = 3x
2 = x
EF = 5x - 3 = 5(2) - 3 = 10 - 3 = 7 cm
GH = 2x + 3 = 2(2) + 3 = 4 + 3 = 7 cm