10u=21+7u

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Solution for 10u=21+7u equation:



10u=21+7u
We move all terms to the left:
10u-(21+7u)=0
We add all the numbers together, and all the variables
10u-(7u+21)=0
We get rid of parentheses
10u-7u-21=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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