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5x = 3x + 8
2x = 8
x = 4
panjang diagonal = 5 . x
= 5 . 4
= 20
diagonal 1 = Diagonal 2
5x = 3x + 8
5x - 3x = 8
2x = 8
x = 8/2
x = 4
Panjang diagonal = 5x = 5 x4 = 20cm