Parallel lines l and m are cut by transversal t. If the interior angles of the same side of t be (3x+4) and (2x-9), SOLVE FOR THE VALUE OF X.

since the angles are supplementary, you have

3x+4 + 2x-9 = 180
...

huh? Just solve it as usual.

3x+4 + 2x-9 = 180
5x-5 = 180
5x = 175
x = 35

How can I transpose that one?

To solve for the value of x, we can set up an equation by equating the given interior angles of the same side of the transversal:

(3x + 4) = (2x - 9)

Now, we can solve for x:

3x + 4 = 2x - 9

Subtract 2x from both sides:

3x - 2x + 4 = -9

Simplify:

x + 4 = -9

Subtract 4 from both sides:

x = -13

Therefore, the value of x is -13.