j+2j=21

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Solution for j+2j=21 equation: 


Simplifying
j + 2j = 21

Combine like terms: j + 2j = 3j
3j = 21

Solving
3j = 21

Solving for variable 'j'.

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

Divide each side by '3'.
j = 7

Simplifying
j = 7

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