Question 214413
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 .
 what is the number?
:
3x + (x+7) = -11 - 2x
4x + 7 = -11 - 2x
4x + 2x = -11 - 7
6x = -18
x = -3
;
:
Check solution in original equation
3(-3) + (-3 + 7) = -11 - 2(-3)
-9 + 4 = -11 + 6
-5 = -5