7+3x=7x-9

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Solution for 7+3x=7x-9 equation: 



7+3x=7x-9

We move all terms to the left:

7+3x-(7x-9)=0

We get rid of parentheses

3x-7x+9+7=0

We add all the numbers together, and all the variables

-4x+16=0

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

-4x=-16

x=-16/-4

x=+4

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