\collayout
\collayout{[left|center|right|solid|dashed]*}
\array{ \arrayopts{\collayout{left solid right}} a & u(x) \\ abc & 0 } = \array{ \arrayopts{\collayout{right left}} a & u(x) \\ abc & 0 }
\array{ \arrayopts{\collayout{left solid center dashed right}} a & u(x) & a + u(x) \\ abc & 0 & 45.9 \\ f(x-c) & f(x+h) - f(x) & f(g(x)) }More information on these commands may be found in Sec. 7.2.1 of the WebTeX documentation.
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