Hello adding

Fill letters instead of digits so the indicated sum (equal letters represent equal digits). What number is hidden under the letter J?

A
A H
A H O
A H O J
--------------------------
4 3 2 1

Result

J =  1

Solution:

Solution in text J =

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To solve this example are needed these knowledge from mathematics:

Do you have a linear equation or system of equations and looking for its solution? Or do you have quadratic equation?

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