$$3 - 4 + 5 = 3 - 9 = - 6$$
$\text{false}$
$$-1+5=3-9\text{ and }3-9=-6$$
$$4=3-9\text{ and }3-9=-6$$
$$4=-6\text{ and }3-9=-6$$
$$\text{false}\text{ and }3-9=-6$$
$$\text{false}\text{ and }-6=-6$$
$$\text{false}\text{ and }\text{true}$$
$$\text{false}$$
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