Question

0,8(8а-14) = 0,6(6а-8) при а= -3 1/12

Answer 1

Может там не "=" а "-" ?

$0,8(8а-14) - 0,6(6а-8) = \ = 6.4a - 11.2 - 3.6a + 4.8 = \ = 2.8a - 6.4 = 2frac{4}{5} times (-3 frac{1}{12}) - 6 frac{2}{5} = \ = frac{14}{5} times ( - frac{37}{12}) - 6 frac{2}{5} = \ = - frac{7 times 37}{5 times 6} - 6 frac{2}{5} = frac{259}{30} - 6 frac{2}{5} = \ = 8 frac{19}{30} - 6 frac{2}{5} = 2 frac{19 - 12}{30} = \ = 2 frac{7}{30} .$