7x+31=21x-9

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Solution for 7x+31=21x-9 equation: 



7x+31=21x-9

We move all terms to the left:

7x+31-(21x-9)=0

We get rid of parentheses

7x-21x+9+31=0

We add all the numbers together, and all the variables

-14x+40=0

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

-14x=-40

x=-40/-14

x=2+6/7

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