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How do I make this in the node editor? I don't get how to go around y=(-x)

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    $\begingroup$ Hello :). If you don't mind me asking, what are such equations in the node editor used for? I have honestly no idea. $\endgroup$ Feb 9, 2020 at 9:29
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    $\begingroup$ @ᴊᴀᴄʜʏᴍᴍɪᴄʜᴀʟ ...for example .. procedural texturing $\endgroup$
    – Robin Betts
    Feb 9, 2020 at 9:36
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    $\begingroup$ @RobinBetts Oh, thank you :). $\endgroup$ Feb 9, 2020 at 9:48

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Labelled 'Layout > Reroute' nodelets not necessary, but often helpful.

Alternatively, if you have complex expressions to convert, you might consider using @Rich Sedman's Node-Expressions add-on, which could generate a group like this:

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It's best to be quite explicit with your bracketing.. In this example, when I didn't bracket the unary minus on x, the negative was applied to the whole expression, rather than binding to the variable. This is expected Python.. but maybe not obvious.

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