$$B=0.45 \div 9 \times 100+2 \times (4.3-5.8)$$
$B=2$
$$B=\frac{45}{900}\times 100+2\left(4.3-5.8\right)$$
$$B=\frac{1}{20}\times 100+2\left(4.3-5.8\right)$$
$$B=\frac{100}{20}+2\left(4.3-5.8\right)$$
$$B=5+2\left(4.3-5.8\right)$$
$$B=5+2\left(-1.5\right)$$
$$B=5-3$$
$$B=2$$
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$B≔2$
