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a= -17
b = -14- -17 = 3
u8= -17 + (7) 3 = 4
u12= -17 + ( 11)3 = 16
jadi
16 +4 = 20
b = -14 - (-17) = 3
u8 = a + 7b
u12 = a + 11b +
u8 + u12 = 2a + 18b
= (2*-17) + (18 *3)
= -34 + 54
= 20
Jadi u8 + u12 = 20