(a + 2b + 3c) − (4a + 6b − 5c) is equivalent to? Can you please explain with some details?

[latex](a + 2b + 3c) - (4a + 6b - 5c)= a + 2b + 3c- 4a-6b + 5c =\\ \\=- 3a - 4b + 8c[/latex]

(a + 2b + 3 c) - (4a + 6b - 5c) = = a + 2b + 3c - 4a - 6b + 5c = = -3a - 4b + 8c