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if axxb = bxxc != 0 with a != -c then sh...

if `axxb = bxxc != 0` with a `!= -c` then show that a+c = kb, where k is scalar.

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`axxb = bxxc`
`axxb =- cxxb`
`:. axxb +cxxb = 0`
`(a+c)xxb =0`
`:. axxb !=0, bxxc != 0` , a,b,c are non zero vectors, `(a+c) != 0`
Hence a+c is paralle to b. `:. a+ c = kb`
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