I am not able to understand this as i have also read an example $1(+) x$ is also not backward stable but still not able to figure it out
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Welcome to MSE. It is in your best interest that you type your questions (using MathJax) instead of posting links to pictures. – José Carlos Santos Mar 01 '21 at 08:22
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I will take care about it in future. – cannabis Mar 01 '21 at 08:47