\left. \begin{array} { l } { a ( a + z ) + 7 ( a + z ) } \\ { x ^ { 2 } + x - 56 } \\ { 3 a ^ { 4 } - 48 b ^ { 4 } } \\ { ( x - y ) ^ { 2 } + ( x - y ) } \\ { 14 a ( 8 + z ) ^ { 3 } + 7 a ( 8 + z ) } \end{array} \right.
Evaluate
\left(a+7\right)\left(z+a\right),\ \left(x-7\right)\left(x+8\right),\ 3\left(a^{4}-16b^{4}\right),\ \left(x-y\right)\left(x-y+1\right),\ 7a\left(z+8\right)\left(2z^{2}+32z+129\right)
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