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hello
to solve for u, we simply need to simplify this equation by performing a subtraction operation
[tex]\begin{gathered} u+5.8=7.57 \\ \end{gathered}[/tex]take 5.8 to the right hand side of the equation
[tex]\begin{gathered} u+5.8=7.57 \\ u=7.57-5.80 \\ u=1.77 \end{gathered}[/tex]from the calculation above, the value of u is equal to 1.77