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a x b = [(x . 4)+(-2 . x)+(4 . -1)]
= [4x-2x-4]= 2x-4
2x-4=0
2x=4
x= 2
a-b+c=[(2-4+2) (-2-2+0) (4-1+1)]
=[ 0 -4 4] atau (-4j+4k)