Question 270375
the mean is adding all the variables up and dividing by that many variables to get ur answer.
so theres 2 variables (x+1) and(12x) so we add them then divide by 2 to =6x
{{{((x+1)+(12x))/2=6x}}}multiply both sides by 2
{{{(x+1)+(12x)=12x}}} add
{{{13x+1=12x}}}subtract 12x and 1 from each side
{{{x=-1}}}this is the only value