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3x - 4 = 20
3x = 24
x = 8
panjang diagonal
3x - 4
= 3 . 8 - 4
= 24 - 4
= 20
maaf kalau salah
Jadi 3x - 4 = 20cm
3x = 24cm
x = 8cm
Panjang diagonalnya adalah 20cm karena sdah diketahui
Semoga dapat membantu ^ ^
Mohon maaf jika terdapat kesalahan dan kekurangan