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W(-2)=8
W(-2)=(-2)⁵-6*(-2)⁴+a*(-2)³+4*(-2)=
-32-6*16-8*a-8= -32 -96-8a-8=-8a-136
-8a-136=8
-8a=8+136
-8a=144 /:(-8)
a=-18