\[\boxed{\mathbf{6.108}}\]
\[\textbf{а)}\ |y| + | - 43| = | - 53|\]
\[|y| + 43 = 53\]
\[|y| = 53 - 43\]
\[|y| = 10\]
\[y = \pm 10.\]
\[\textbf{б)}\ |y| \cdot | - 11| = | - 88|\]
\[|y| \cdot 11 = 88\]
\[|y| = 88\ :11\]
\[|y| = 8\]
\[y = \pm 8.\]