in reply to How would you solve a user-inputted simple one-variable Linear Equation
If this is for less than 2000 non-commercial runs a month, I'd probably sign up for the Wolfram/Alpha API.
Example: 2+3x+7(x+27)-6= 23x-45-(145+62-5)x
Dunno what their commercial rates are like. The fact that they don't publish them is probably a bad sign.
(I'm not associated with them in any way!)
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