21+u=4u

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Solution for 21+u=4u equation:



21+u=4u
We move all terms to the left:
21+u-(4u)=0
We add all the numbers together, and all the variables
-3u+21=0
We move all terms containing u to the left, all other terms to the right
-3u=-21
u=-21/-3
u=+7

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