4+6+7+9+7+9+7+9+7+8+9+4
= ( 4 + 6 ) + ( 7 + 7 + 7 + 7 ) + ( 9 + 9 + 9 + 9 ) + 8 + 4
= 10 + 7 x 4 + 9 x 4 + 8 + 4
= ( 10 + 28 ) + ( 36 +4 )
= 38 + 40
= 78
4+6+7+9+7+9+7+9+7+8+9+4
= 4x2 + 7x4 + 9x4 + 8 + 6
= 8 + 28 +36 +8 +6
= 86
(4.2)+(7.4)+(9.4)+6+8
8+28+36+6+8
36+42+8
78+8=86