5x-21=51-4x

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Solution for 5x-21=51-4x equation: 



5x-21=51-4x

We move all terms to the left:

5x-21-(51-4x)=0

We add all the numbers together, and all the variables

5x-(-4x+51)-21=0

We get rid of parentheses

5x+4x-51-21=0

We add all the numbers together, and all the variables

9x-72=0

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

9x=72

x=72/9

x=8

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