20x=21x-7

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Solution for 20x=21x-7 equation: 



20x=21x-7

We move all terms to the left:

20x-(21x-7)=0

We get rid of parentheses

20x-21x+7=0

We add all the numbers together, and all the variables

-1x+7=0

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

-x=-7

x=-7/-1

x=+7

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