To solve the equation 1/4 + 1/3 = 3x = -5, we need to simplify the left side of the equation first.

1/4 + 1/3 can be combined by finding a common denominator, which is 12.

(1/4)(3/3) + (1/3)(4/4) = 3/12 + 4/12 = 7/12

Now the equation becomes:

7/12 = 3x = -5

To solve for x, we need to isolate it. Let's start by getting rid of the fraction by multiplying both sides of the equation by the reciprocal of 3/1, which is 1/3.

(1/3)(7/12) = (1/3)(-5)

7/36 = -5/3

Now, we can solve for x by dividing both sides of the equation by 7/36.

(7/36)/(7/36) = (-5/3)/(7/36)

1 = -60/21

However, -60/21 is not equal to 1, so there is no solution to this equation.