Answer
$y=-8x-23$
Work Step by Step
Simplify within the grouping symbols to have:
$\\\\y-9=-8[x+4]$$
$\\\\\\$Distribute $-8$ to have:
$\\\\y-9=-8x-32$
$\\\\\\$Add 9 to both sides to have:
$\\\\y-9+9=-8x-32+9
\\\\y+0=-8x-23
\\\\y=-8x-23$
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