Errors when solving an equation

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Sokolov
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I'm new with Mathematica and I'm not sure why when I enter this equation an error happens. Could anyone please help me with it?

1587900837349.png
 

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You need to replace your “=“ with “==“. The single “=“ sets the thing in the left to the value on the right. The double “==“ is a logical test of equality and returns True if the left side is equal to the right.
 
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Okay, how basic was it... Thank you!
 
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No problem. The syntax of Mathematica is a little unusual and takes some getting used to. But once you do get used to it it is very clear and concise and nice to work with.
 

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