1.

45-[28-{37-(15-x)}]=58, then the value of x is

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Step-by-step EXPLANATION:

45-[28-{37-(15-x)}]=58

{:}\longrightarrow45-[28-{37-15+x}]=58

{:}\longrightarrow45-[28-37+15-x ]

{:}\longrightarrow45-[6-x]=58

{:}\longrightarrow45-6+x=58

{:}\longrightarrow39+x=58

{:}\longrightarrowx=58-39

\therefore{\underline{\boxed{\bf {x=19}}}}



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