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u5: a+ 4b= -2
-3b = 9
b = -3
a + (-3)= 7
a=7+3
a= 10
u10=a+9b
10+9(-3)
10-27=-17
u1=10
U2=7
u3=4
u4=1
u5=-2
u6=-5
u7=-8
u8=-11
U9=-14
u10=-17