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3x + 4 = 5x -8
12 = 2x
6 = x
Panjang diagonal = 3x + 4 = 18 + 4 = 22 cm
-2x = -12
x = 6
AC = 3x + 4
= 18 + 4
= 22
BD = 5x - 8
= 30 - 8
= 22