Answer:
r = -1
or
r = 1
Step-by-step explanation:
because the outer lines "| |" mean the absolute value, or the absolute opposite value of what is inside "| |"
this means that if r = -1 then
3(-1) = -3 but -3 is in "| |" so
|-3| = 3
and
|3| = 3
therefore r can equal -1 and/or 1
Hope this helps!
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