$$\frac{ 0.28 }{ 0.84 } + \frac{ 0.23 }{ 0.03 } - \frac{ 0.9 }{ 0.05 }$$
$-10$
$$\frac{28}{84}+\frac{0.23}{0.03}-\frac{0.9}{0.05}$$
$$\frac{1}{3}+\frac{0.23}{0.03}-\frac{0.9}{0.05}$$
$$\frac{1}{3}+\frac{23}{3}-\frac{0.9}{0.05}$$
$$\frac{1+23}{3}-\frac{0.9}{0.05}$$
$$\frac{24}{3}-\frac{0.9}{0.05}$$
$$8-\frac{0.9}{0.05}$$
$$8-\frac{90}{5}$$
$$8-18$$
$$-10$$
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