$$4=21=(1-11)(42-31)/(82-61)$$
$\text{false}$
$$\text{false}\text{ and }21=\frac{\left(1-11\right)\left(42-31\right)}{82-61}$$
$$\text{false}\text{ and }21=\frac{-10\left(42-31\right)}{82-61}$$
$$\text{false}\text{ and }21=\frac{-10\times 11}{82-61}$$
$$\text{false}\text{ and }21=\frac{-110}{82-61}$$
$$\text{false}\text{ and }21=\frac{-110}{21}$$
$$\text{false}\text{ and }21=-\frac{110}{21}$$
$$\text{false}\text{ and }\frac{441}{21}=-\frac{110}{21}$$
$$\text{false}\text{ and }\text{false}$$
$$\text{false}$$
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