$$1(-1-8)+2(0+8)+3(0-2)$$
$1$
$$1\left(-9\right)+2\left(0+8\right)+3\left(0-2\right)$$
$$-9+2\left(0+8\right)+3\left(0-2\right)$$
$$-9+2\times 8+3\left(0-2\right)$$
$$-9+16+3\left(0-2\right)$$
$$7+3\left(0-2\right)$$
$$7+3\left(-2\right)$$
$$7-6$$
$$1$$
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