5 + 20 into 40 into 10 + 80 - 10
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20×40×10+5+80-10
800×10+5+80-10
8000+5+80-10
8005+80-10
80085-10=80075
800×10+5+80-10
8000+5+80-10
8005+80-10
80085-10=80075
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