u1=5
u3=a+2b
11=5+2b
11-5=2b
6=2b
3=b
jadi beda nya adalah 3
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U3 = 11
b = 11-5 : 3-1 = 6 : 2 = 3
u1=5
u3=a+2b
11=5+2b
11-5=2b
6=2b
3=b
jadi beda nya adalah 3