Answer
$(2r-5)(3r-4)$
Work Step by Step
Rewrite -23r as -8r + -15r
$6r^{2} - 23r + 20 = 6r^{2} - 8r - 15r + 20$
Factor out GCF of each pair of terms, which would be
$2r(3r-4) -5(3r-4)$
Now use distributive property =
$(2r-5)(3r-4)$
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