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U8=-6
a+2b=9 ----> a=15
a+7b=-6
________ _
-5b=15
b=-3
U15=15+(-3)(14)
=-27
u3 = a+2b =9 -
5b=-15
b= -3
U3 = a + 2(-3) = 9
= a+ (-6) = 9
a=9+6=15
U15 = 15+14(-3)
= 15 + (-42)
= -27