21=-x+7

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Solution for 21=-x+7 equation: 



21=-x+7

We move all terms to the left:

21-(-x+7)=0

We add all the numbers together, and all the variables

-(-1x+7)+21=0

We get rid of parentheses

1x-7+21=0

We add all the numbers together, and all the variables

x+14=0

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

x=-14

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