A simple example is that in LibreOffice Calc (spreadsheet program) type in any cell, the formula: "=SUM(2+3)" (without the quotes) and the answer will appear on pressing enter.
If by equation you mean something like: "y + 9 = 15" then the value of y could be put in A1 and called with, in B1: "=A1+9" So A1 would be 6.
If you didn't mean Calc, then more info is needed as to which LibreOffice program you mean.
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The equation of uncertainty principle is ΔxΔp≥ℏ.
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You write it as an equation, and then solve the equation.