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U2 = x + 2
U3 = x + 2(2) = x + 4
108 = x + x + 2 + x + 4
108 = 3x + 6
108 - 6 = 3x + 6 - 6
102 = 3x
102/3 = x
34 = x
U1 = x = 34
U2 = x + 2 = 34 + 2 = 36
U3 = x + 4 = 34 + 4 = 38
3x+6=108
3x=108-6=102
x=102÷3=34