7x+9=7x-12

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Solution for 7x+9=7x-12 equation: 



7x+9=7x-12

We move all terms to the left:

7x+9-(7x-12)=0

We get rid of parentheses

7x-7x+12+9=0

We add all the numbers together, and all the variables

21!=0

There is no solution for this equation

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