$$(- \frac{ 4 }{ 9 } + \frac{ 3 }{ 7 } ) \times ( \frac{ 9 }{ 10 } +- \frac{ 1 }{ 5 } )$$
$-\frac{1}{90}\approx -0.011111111$
$$\left(-\frac{28}{63}+\frac{27}{63}\right)\left(\frac{9}{10}-\frac{1}{5}\right)$$
$$\frac{-28+27}{63}\left(\frac{9}{10}-\frac{1}{5}\right)$$
$$-\frac{1}{63}\left(\frac{9}{10}-\frac{1}{5}\right)$$
$$-\frac{1}{63}\left(\frac{9}{10}-\frac{2}{10}\right)$$
$$-\frac{1}{63}\times \frac{9-2}{10}$$
$$-\frac{1}{63}\times \frac{7}{10}$$
$$\frac{-7}{63\times 10}$$
$$\frac{-7}{630}$$
$$-\frac{1}{90}$$
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$-\frac{1}{90} = -0.011111111111111112$
