I been working on this for minutes and i dont know how to solve this

SO, we know that angle B is 26 degrees, so the 4N+7 angle is also 26 degrees, because of the corresponding angles therum. Does that help  in any way?

Well you know that the two angles at C add to a straight angle (how many degrees is that?), you can use that to find n.

then

The two interior angles of a triangle = the opposite exterior angle 

Use that to find  m

im still not getting it

Note that the two angles designated as 4n + 7  and 4n + 5  are straight angles.....they sum to 180

So...let's solve for n....and we have

4n + 7  + 4n + 5  = 180   simplify

8n  + 12  = 180   subtract 12 from both sides

8n  = 168   divide by 8 on both sides

n  = 21

Now....by the Exterior Angle Theorem....m equals the sum of [ 4n + 5]  + [26]

And  n  = 21......so....m  =  4(21) + 5 + 26  =  84 + 5 + 26  =  89 + 26  =  115

Note, Rebirth....adding the angles  4n + 7  and 4n + 5....we want to combine like terms.....so

4n + 4n    + 5 + 7  =

8n  + 12