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misal u1 = x
maka jangkauan = 50
U3 - U1 = 50
u3 = U1 +50
u3 = x + 50
u2 = 756
(u1+u2+u3)/3 = 768 2/3
x + 756 + x + 50 = 2306
2x + 806 = 2306
2x = 1500
x = 750
maka datanya = 750, 756, 800