Question 111613
{{{-12(x-1)6*7 = 0}}}.........multiply {{{6*7}}}

{{{-12(x-1)42 = 0}}}.........multiply {{{-12*42}}}


{{{-12*42(x-1) = 0}}}.........

{{{-504(x-1) = 0}}}.........multiply each term of binomial {{{x - 1}}} by {{{504}}}

{{{-504x + 504 = 0}}}.........move {{{-504x }}} to the right

{{{ 504 = 504x}}}.........divide both sides by {{{504}}} 

{{{ 504/504 = 504x/504}}}.........

{{{ 1 = x}}}....or

{{{x = 1 }}}