0\;\;\;\;\;+ + + (3)- - - -(4) + + + +\\x\in (-\infty,3)U(4,+\infty)" alt="\frac{x-1}{x-3}<3,\;\;\;\frac{x-1}{x-3}-3<0,\\\\\frac{x-1-3(x-3)}{x-3}<0\\\\\frac{-2x+8}{x-3}<0\\\frac{-2(x-4)}{x-3}<0\\\\\frac{2(x-4)}{x-3}>0\;\;\;\;\;+ + + (3)- - - -(4) + + + +\\x\in (-\infty,3)U(4,+\infty)" align="absmiddle" class="latex-formula">