Respuesta :

[tex]42\%\ of\ x\ is\ 168\\\\42\%=\dfrac{42}{100}=0.42\\\\42\%\ of\ x\to0.42x\\\\the\ equation:\\\\0.42x=168\ \ \ |divide\ both\ sides\ by\ 0.42\\\\\boxed{x = 400}[/tex]
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