7=20x+21

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Solution for 7=20x+21 equation: 



7=20x+21

We move all terms to the left:

7-(20x+21)=0

We get rid of parentheses

-20x-21+7=0

We add all the numbers together, and all the variables

-20x-14=0

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

-20x=14

x=14/-20

x=-7/10

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