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

:operation, numeric simplify

:, Evaluate and Simplify

: $submit1
 <input type="text" name="formula" size="25" maxlength="100" value="$var_1">

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