6-7x=7x-9x-21

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Solution for 6-7x=7x-9x-21 equation: 



6-7x=7x-9x-21

We move all terms to the left:

6-7x-(7x-9x-21)=0

We add all the numbers together, and all the variables

-7x-(-2x-21)+6=0

We get rid of parentheses

-7x+2x+21+6=0

We add all the numbers together, and all the variables

-5x+27=0

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

-5x=-27

x=-27/-5

x=5+2/5

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