Answer:
Both angles are 64. See discussion below
Explanation:
Comment
You can only do this if you assume that LN cuts <KLM in half (ie it is a bisector).
Givens
<KLM = 128
<KLN = 10x + 19
Solution
If the assumption under the comment is correct, then the equation
2(10x + 19) = 128. Both equal angles add up to 128. Remove the brackets.
2*10x + 19*2 = 128 Combine
20x + 38 = 128 Subtract 38 from both sides
20x +38-38 = 128-38
20x = 90 Divide both sides by 20
20x/20=90/20
x = 4.5
Angles
<kLN = `10x + 19 = 10*4.5 + 19 = 45 + 19 = 64
<NLM = 64