:algebra, prealgebra, pre-algebra,
simplify, numerical simplify, simplify numerically, evaluate

:operation, numeric simplify

:, Evaluate and Simplify

:<TD ALIGN=LEFT style="text-align:center;" HEIGHT=30 NOWRAP>
 <INPUT TYPE=TEXT NAME="formula" SIZE=25 MAXLENGTH=100 VALUE="$var_1"></TD>
 <TD ALIGN=RIGHT VALIGN=center NOWRAP>
 $submit1

:2/3 + 7/8, 4/7 - 4/9, (x^18-1)/(x^6-1), 1/(x+1) - 1/(x-1)
