In ΔJKL, JL‾JL is extended through point L to point M,m∠KLM=(7mx+3)°m∠KLM=(7x+3)°,m∠LJK=(2x+12°m∠LJK=(2x+12°,and m∠JKL=(3x+7)°m∠JKL=(3x+7)°.Find m∠LJK.m∠LJK.