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In the context of generic problems or quickchecks you may want to add an input field inline to your question text. 
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Example: 
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Given are $$a = 2, b = 3, c = 2, d = 1$$ 
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$$a + b = $$ <input field>, and $$c + d = $$ <input field>. 

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+Given are 

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+$$a = 2, b = 3, c = 2, d = 1$$ 

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+ 

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+$$a + b = $$ <input field>, 

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+and $$c + d = $$ <input field>. 
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For this purpose you can use the command `\ansref` in the question text. The placeholder will then be replaced by the answer defined in the answer environment. Make sure you define as many answers as the number of \ansref used. 
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