5x-21=7x

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Solution for 5x-21=7x equation: 



5x-21=7x

We move all terms to the left:

5x-21-(7x)=0

We add all the numbers together, and all the variables

-2x-21=0

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

-2x=21

x=21/-2

x=-10+1/2

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