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b = 2
maka bentuknya
x + x + 2 + x + 4 = 111
3x + 6 = 111
3x = 111-6
3x = 105
x = 105/3
x = 35
U1 = x = 35
U2 = x + 2 = 35 + 2 = 37
U3 = x + 4 = 35 + 4 = 39