Solve the given Linear $1^($st $)$ Order Differential Equation by assuming the solution

is y$=\backslash$sum$\_($n$=0)^(\backslash$infty $)$ c$\_($n$)$x$^($n$)$; then verify your solution is correct using $1^($st $)$ Order Methods.

$(1+$x$)$y$^(\text{'})+$y$=0$