Answer
$3.1x-0.3$
Work Step by Step
Removing the grouping symbols and then combining like terms, the given expression, $
(2.1x-5.6)-(-x-5.3)
,$ simplifies to
\begin{array}{l}\require{cancel}
2.1x-5.6+x+5.3
\\\\=
(2.1x+x)+(-5.6+5.3)
\\\\=
3.1x-0.3
.\end{array}
