Answer
$0$
Work Step by Step
Here, we have $a_1=-b_1=-4$, $a_2=-b_2=-2$,$a_3=-b_3=0$,$a_4=-b_4=2$,$a_5=-b_5=4$
Thus,
$=[-4+3(4)]+[-2+3(2)]+[0+3(0)]+[2+3(-2)]+[4+3(-4)]$
$=8+4+0-4-8$
$=0$
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