Logical Equations Riddle

Can you solve this Logical Equations Riddle?

Riddle to solve Logical Equation

Click here to solve similar Logical Equations Puzzles

Answer to this Riddle is given as below

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Answer to this riddle is 9. It is sums of number on the dice face which is touching the ground. 

On dice the opposite numbers always add to 7. So one can look at the upper dice face to get the number at the opposite face to get the numbers for last equations as 4 + 3 + 2 = 9