Question 739062
x = "a number", and then the opposite of x is (-x).


the sum of -4 and the opposite of a number:  {{{-4+(-x)}}}


...if that sum is multiplied by -3:
tricky.  The "is" does not yet mean "equals".
{{{(-4+(-x))*(-3)}}}


... the result is 6 less than: {{{(-4+(-x))*(-3)=-6______________}}}?


... the product of the number and 2:  {{{highlight((-4+(-x))*(-3)=-6+2x)}}}


Most of the work was developing the equation from the described data.  Now just solve for x.
Final solved result is {{{highlight(x=-18)}}}.