7+14x=21x-21

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Solution for 7+14x=21x-21 equation: 



7+14x=21x-21

We move all terms to the left:

7+14x-(21x-21)=0

We get rid of parentheses

14x-21x+21+7=0

We add all the numbers together, and all the variables

-7x+28=0

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

-7x=-28

x=-28/-7

x=+4

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