deletions | additions       diff --git a/begin_equation_begin_cases_x___.tex b/begin_equation_begin_cases_x___.tex  index da7aea6..dea2f56 100644  --- a/begin_equation_begin_cases_x___.tex  +++ b/begin_equation_begin_cases_x___.tex 
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\begin{equation}  \labes{sys1}  \begin{cases}  x_{k+1} = a\cdot x_{k}+k\cdot sin(k) + \xi_{k}  \\