$$- \{ (-3)+(-4)-(-5) \} -[(-8)+(-3)-(+10)]$$
$23$
$$-\left(-7-\left(-5\right)\right)-\left(-8-3-10\right)$$
$$-\left(-7+5\right)-\left(-8-3-10\right)$$
$$-\left(-2\right)-\left(-8-3-10\right)$$
$$2-\left(-8-3-10\right)$$
$$2-\left(-11-10\right)$$
$$2-\left(-21\right)$$
$$2+21$$
$$23$$
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