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6x - 3 = 27
6x = 30
x = 5
2x - 5 = 15 cm
x + 6 = 11 cm
3x - 4 = 11 cm
Panjang sisi yang sama = 11 cm
6x-3 = 27
6x = 30
x = 30/6
x = 5
maka sisi yg sama
x+6 = 5+6 = 11 dan
3x-4 = 3(5)- 4 = 15-4 = 11
jadi jawabannya adlh c. 11