\[Стр.\ 35.\]
\[\boxed{\mathbf{8.}}\]
\[\textbf{а)}\ 3x + 0,6x = 3,6x\]
\[y - 0,2y = 0,8y\]
\[0,7a + 5,9a = 6,6a\]
\[b - 0,3b = 0,7b\]
\[\textbf{б)}\ 7,8y + y = 8,8y\]
\[20x - 0,1x = 19,9x\]
\[a + 0,4a = 1,4a\]
\[b - 0,96b = 0,04b\]