21-6u=27-8u

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Solution for 21-6u=27-8u equation: 



21-6u=27-8u

We move all terms to the left:

21-6u-(27-8u)=0

We add all the numbers together, and all the variables

-6u-(-8u+27)+21=0

We get rid of parentheses

-6u+8u-27+21=0

We add all the numbers together, and all the variables

2u-6=0

We move all terms containing u to the left, all other terms to the right

2u=6

u=6/2

u=3

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