56=21+5u

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Solution for 56=21+5u equation:



56=21+5u
We move all terms to the left:
56-(21+5u)=0
We add all the numbers together, and all the variables
-(5u+21)+56=0
We get rid of parentheses
-5u-21+56=0
We add all the numbers together, and all the variables
-5u+35=0
We move all terms containing u to the left, all other terms to the right
-5u=-35
u=-35/-5
u=+7

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