12-3 (2w+1)=7w-3 (7+w)
\(12-3(2w+1)=7w-3(7+w) \\ \\ 12-6w-3=7w-21-3w \\ \\ 9-6w=4w-21 \\ \\ -6w-4w=-21-9 \\ \\ -10w=-30 \\ \\ \boxed{x=\frac{-30}{-10}=3}\)
\(12-3(2w+1)=7w-3(7+w)\\\\ 12-6w-3=7w-21-3w\\\\ -6w-7w+3w=-21-12+3\\\\ -10w=-30\ \ \ |Divided\ by\ -10\\\\ w=3\\\\ \textbf{Answer\ is\ w=3.}\)
