Basic Algebra/Systems of Linear Equations/Chapter Test

Please post your test problems this way: $$x+11=36$$:
 * Problem:(answer,level of difficulty(easy, medium, hard))
 * Example

($$x=36-11=25$$, easy)



\begin{cases} x+11=y+111\\ y=-3x \end{cases} $$

$$x+11=-3x+111$$

$$x=25$$ ,($$25+11=36$$)

($$y=36-111=-75$$, medium)