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6x - 2 = 2x + 10
6x -2x -2 + 2 = 2x - 2x + 10 + 2
4x = 12
x = 12 : 4
x = 3
sehingga
6x - 2 = 6(3) - 2 = 18 - 2 = 16 cm
buktikan
2x + 10 = 2(3) + 10 = 6 + 10 = 16 cm