21+x=2x-41 because the number (x) that 21 is added to is 41 <em>less than</em> (so subtraction) <em>twice </em>(so multiply the number x by 2) the number (x).
Get the x's on one side by subtracting the single x
21=x-41
Now add 41 to both sides to completely isolate x
62=x
So, your answer is x=62. The number is 62.
Check your work. 62+21=83. 2(62)= 124. 124-41=83. Both equations equal 83, so the solution is correct.
