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Step-by-step explanation:
Let the other number be x
then the positive number would be 5x
If 21 is added both then they will x+21 and 5x+21
then they will become
5x+21=2(x+21)
=>5x+21=2x+42
=>5x-2x=42-21
=>3x=21
=>x=21/3
=>x=7
the other number ( x )=7
the positive number( 5x)=5×7=35
check:
7×5=35
7+21=28
35+21=56
2×28=56
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