-16m+5(2m+3)
-16m+5(2m+3)=15-6m OK.....let's simplify this
-16m + 10m + 15 = 15 - 6m
-6m + 15 = 15- 6m
15 - 6m = 15 - 6m this is an identity.......any m will wwork......!!!
-16m+5(2m+3)=15-6m