$$\left. \begin{array} { l } { - 28 - 14 = - 42 } \\ { - 15 + 8 = - 7 } \end{array} \right.$$
$\text{true}$
$$-42=-42\text{ and }-15+8=-7$$
$$\text{true}\text{ and }-15+8=-7$$
$$\text{true}\text{ and }-7=-7$$
$$\text{true}\text{ and }\text{true}$$
$$\text{true}$$
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