Question 933326
Four years ago, 
{{{H-4=3(A-4)}}}
{{{H-4=3A-12}}}
1.{{{H=3A-8}}}
.
.
.
{{{H+3=2(A+2)}}}
{{{H+3=2A+4}}}
2.{{{H=2A+1}}}
Substituting from eq. 1,
{{{3A-8=2A+1}}}
{{{A=9}}}
Then,
{{{H=3(9)-8}}}
{{{H=27-8}}}
{{{H=19}}}