Question

3. Найдите корень уравнения и выполните проверку: 2/9 (1,8y - 5,4) –3/7 (2, 1y - 4,2)=0,6​

Answer 1

$\displaystyle \frac{2}{9}(1,8y-5,4)-\frac{3}{7}(2,1y-4,2)=0,6\\ \\\frac{2}{9}(\frac{9}{5}y-\frac{27}{5})-\frac{3}{7}(\frac{21}{10}y-\frac{21}{5})=\frac{3}{5}\\ \\\frac{2}{5}y-\frac{6}{5}-\frac{9}{10}y+\frac{9}{5}=\frac{3}{5}\\ \\\frac{2}{5}y+\frac{3}5}-\frac{9}{10}y=\frac{3}{5}\\ \\4y+6-9y=6\\ 4y-9y=0\\ -5y=0\\ y=0$