Hi

Let x represent that number

Question states***

 2(x+20) = x-6

Solving for x

      x = -46

CHECKING our Answer***

 2(-26) = -52 = -46-6 

Answer by rwm(914)   (Show Source): You can put this solution on YOUR website!
 (20+x)*2=x-6

40+2x=x-6

40=-x-6

46=-x

x=-46

20-46*2=-46-6

-26*2=-52

-52=-52

x=-46 

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