Como determinar o vetor x tal que x . (1,4,-3) = -7 e x vetorial (4,-2,1) = (3,5,-2)?

Como determinar o vetor x tal que x escalar (1,4,-3) = -7 e x vetorial (4,-2,1) = (3,5,-2)?

A resposta é x = (3, -1, 2).

Não consigo resolver..

alguem pode me ajudar?\

Obg (:

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