$$4+ \{ 4-9-[9+4-(3+6)-5]+3 \}$$
$3$
$$4+-5-\left(9+4-\left(3+6\right)-5\right)+3$$
$$4+-5-\left(13-\left(3+6\right)-5\right)+3$$
$$4+-5-\left(13-9-5\right)+3$$
$$4+-5-\left(4-5\right)+3$$
$$4+-5-\left(-1\right)+3$$
$$4-5+1+3$$
$$4-4+3$$
$$3$$
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