i never saw something like this but imma give it a go.......even though i have no idea what the comma is doing in a math problem :)
6m+n=-1+2m+3n=-19
(im guessing the comma is supposed to be a addition sign)
so first i think you subtract 2m on both sides of the first equal sign
4m+n=-1+3n=-19
Then i believe you would subract +n on both sides of the first equal sign
4m=-1+2n=-19
Then i think you add -1 to -19
4m=2n=-18
and tbh i think this will be your final answer, but then again i said ill give this a go, so if you dont wanna try what i did and put it on your paper, you obviously dont have to, and like i said this is not 100 percent to be correct, i gave it a go even tho i never saw anything like that before.
Hope this type helps
