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4x = 2x + 8
4x - 2x =2x - 2x + 8
2x = 8
2x : 2 = 8 : 2
x = 4
maka diagonalnya
4x = 4 x 4 = 16 cm
buktikan lagi
2x + 8 = 2(4) + 8 = 8 + 8 = 16 cm