Solve the equation: 14x + 3x - 40 = 11

14x + 3x - 40 = 11

17x - 40 + 40 = 11 + 40
17x = 51
x = 3

To prove it:

14(3) + 3(3) - 40 = 11
42 + 9 - 40 = 11
51 - 40 = 11
11 = 11

Yep! It works!