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3x = 15
x = 5
diagonal panjang = 4x +7
= 4 . 5 + 7
= 20 + 7
= 27 cm
7x-8 = 4x + 7
7x - 4x = 8 + 7
3x = 15
x = 5
panjang diagonal = 7x - 8 = 7(5) - 8 = c.27 cm