2J-J=21

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Solution for 2J-J=21 equation: 


Simplifying
2J + -1J = 21

Combine like terms: 2J + -1J = 1J
1J = 21

Solving
1J = 21

Solving for variable 'J'.

Move all terms containing J to the left, all other terms to the right.

Divide each side by '1'.
J = 21

Simplifying
J = 21

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