sin and cos and triangles oh my

hello everyone i hope your all well :), anyway im new to the forum and need a little help solving some math problems i hope you can help me, first off im not very good at math and i have a hard time explaining the math so im sorry if i dont make much since but here it goes, basicly depend on the question i have to solve for either, A, a, B, b, C or c for either angle or degree if you under stand so far and i have some answered but the ones with the first angle and degrees to solve for the others confuses me here is an example $\displaystyle A = 49\deg , B = 44\deg, a = 18.7$ its the 18.7 with the others that confuses me, the way my teacher said to solve it, is like this, $\displaystyle 18.7\times \sin49\deg = 14.11 \div \sin44\deg = 20.31$, which is not even an answer, so if someone has an easier way to solve a problem like this where a number is like 18.7 (with the point 7 or point whatever) please let me know and step by step on how to solve it please and im really really sorry for the long post. thanks in advance.