21=3u+4u

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Solution for 21=3u+4u equation:



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

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