Answer:
64
Step-by-step explanation:
Each side length is being multiplied by 8
5*8 is 40 so you multiply 8 by 8
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-4r-11=4r+21
Move 4r to the other side
Sign changes from +4r to -4r
-4r-4r-11=4r-4r+21
-4r-4r-11=21
-8r-11=21
Move -11 to the other side
Sign changes from -11 to +11
-8r-11+11=21+11
-8r=21+11
-8r=32
Divide both sides by -8
-8r/-8=32/-8
Answer: r=-4
Oh, I remember this one. Here's this if you need it, if it doesn't help then let me know.
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I have no idea
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