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Ответ дан
mursalovasuriya

 frac{a}{b}  =  frac{c}{d}

a times d = b times c

(x - 8) times  frac{16}{3}  =  frac{81}{7}  times  frac{8}{27}

(x - 8) =  frac{81 times 8}{7 times 27}  div  frac{16}{3}

(x - 8) =  frac{81 times 8}{7 times 27}   times  frac{3}{16}

x - 8 =  frac{9}{14}

x = 8 +  frac{9}{14}  =  8 frac{9}{14}

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