In the diagram below of triangle L, M, NLMN, OO is the midpoint of start overline, L, N, end overline
LN
and PP is the midpoint of start overline, M, N, end overline
MN
. If mangle, N, L, M, equals, minus, 6, x, plus, 78∠NLM=−6x+78, and mangle, N, O, P, equals, 9, x, plus, 33∠NOP=9x+33, what is the measure of angle, N, O, P∠NOP?