Question 97631
Let x = "a number"
:
the sum of three times a number and 7 more than the number is the same as the difference between -11 and twice the number.
:
3x + (x+7) =  2x - (-11)
4x + 7  = 2x + 11
4x - 2x = 11 - 7
2x = 4
x = 2
:
:
Check solution:
"sum of three times a number and 7 more than the number is the same as the difference between -11 and twice the number." 
3(2) + (2+7) = 2(2) - (-11)
 6 + 9 = 4 + 11