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Control key

In computing, a control key is a key stroke, while holding down the Control key, with a special function.

For example, ctrl-a means "select all".

For ctrl-x, ctrl-c and ctrl-v, see also Cut and paste and Copy and paste.

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... \right) x + \frac{c}{a}=0 </math> which is equivalent to <math>x^2+\frac{b}{a}x=-\frac{c}{a}.</math> The equation is now in a form in which ...