Consider LHS As we hav (2+6+7)+9=24 (3+4+4)+29=40 (8+2+8)+55=73 similarly (7+3+9)+87=106

Now Consider no. 9 then 29 then 55 then 87 Its series of difference 29 and 9 as 5×4+0=20 Then 55 and 29 as 5×5+1=26 Then 87 and 55 as 5×6+2=32