To say that x556\displaystyle {\left|{\frac{{{x}-{5}}}{{{5}}}}\right|}\leq{6} is the same as saying x\displaystyle {x} is in the closed interval [A,B]\displaystyle {\left[{A},{B}\right]}
where A\displaystyle {A} is:  


and where B\displaystyle {B} is: