Question

решите уравнение 1/3х+5/7=2/7-1/9

Answer 1

$frac{1}{3} x + frac{5}{7}= frac{2}{7 }- frac{1}{9}$
$frac{1}{3}x + frac{5}{7} = frac{2*9-1*7}{7*9}= frac{1}{3} x + frac{5}{7} = frac{11}{63}$$63* frac{1}{3} x + 63* frac{5}{7}= 63* frac{11}{63} = 21x+9*5 = 11$