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Answer:
45
Step-by-step explanation:
Line C is a transversal as it crosses both a and b which appear to be parallel.
Using this, angle 2 and angle 4 are congruent.
This means :
8x-19 = 5x+5
Solving this gives us x = 8.
Now if we plug 8 back into the formula for m<4, we'd get 5(8)+5 or 45.