7x+x=5x+4x

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Solution for 7x+x=5x+4x equation: 



7x+x=5x+4x

We move all terms to the left:

7x+x-(5x+4x)=0

We add all the numbers together, and all the variables

7x+x-(+9x)=0

We add all the numbers together, and all the variables

8x-(+9x)=0

We get rid of parentheses

8x-9x=0

We add all the numbers together, and all the variables

-x=0

x=0/-1

x=0

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