Question

8-9|10r-9|=-73How the heck do you do this?

Answer 1

$8-9|10r-9|=-73\\\\-9|10r-9|=-81\\\\|10r-9|=9\\\\10r-9=9 \vee 10r-9=-9\\\\10r=18 \vee 10r=0\\\\r=\dfrac{9}{5}\vee r=0$