"Free" and "Step-by-step solution graphs included" sounded too good to be true. Guess it was. As soon as I tried to enter the webpage, Bitdefender (antivirus) stopped me and reported the webpage wasn't safe and had tried to download two trojans.
It's the first time I´ve seen the antivirus do something in the two years I've had it. Guess I'll stick with Wolfram. It's pretty good even if you can't get step-by-step solutions w/o the premium version.
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