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9x-4 = 3x+8
9x-3x = 4+8
6x=12
x=12/6
x=2
Panjang diagonalnya:
3x+8 = (3x2) + 8 = 6+8 = 14 cm
= 6x = 12
= x = 12:6=2
9x -4= 9(2)-4
18-4=14