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50 = a + (9-1) 5
50 = a + 8 x 5
50 = a + 40
50-40 = a
10 = a
10,15,20,25,30,35,40,45,50
u1,u2,u3,u4,u5,u6,u7,u8,u9
a+8.5=50
a=50-40
a=10
Jadi udh dpt kuncinya.
a=10
b=5
u1=10
u2=15
u3=20
u4=25
u5=30