Question 963451
{{{x[n]=x[0]+(n-1)d}}}
{{{x[12]=x[0]+(12-1)5=36}}}
{{{x[0]+55=36}}}
{{{x[0]=-19}}}
So then,
{{{x[20]=-19+(19)5=76}}}
{{{x[8]=-19+(7)5=16}}}