Given m ∠ L O N m∠LONm, angle, L, O, N is a straight angle. m ∠ L O M = 4 x + 3 0 ∘ m∠LOM=4x+30 ∘ m, angle, L, O, M, equals, 4, x, plus, 30, degrees m ∠ M O N = 8 x + 9 0 ∘ m∠MON=8x+90 ∘ m, angle, M, O, N, equals, 8, x, plus, 90, degrees Find m ∠ M O N m∠MONm, angle, M, O, N: O O L L N N M M ∘ ∘