СРОЧНО, ПЛИЗ!!! Вычислите: (3x-7)^2=121

[latex]\displaystyle(3x-7)^2=121 [/latex] [latex]\displaystyle|3x-7|=11[/latex] [latex]\displaystyle \left \{ {{3x-7=11} \atop {3x-7=-11}} \right. [/latex] [latex]\displaystyle \left \{ {{3x=18} \atop {3x=-4}} \right. [/latex] [latex]\displaystyle \left \{ {{x=6} \atop {x=-4/3}} \right. [/latex] Ответ х=6, х= -1¹/₃