84=-7x+63

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Solution for 84=-7x+63 equation: 



84=-7x+63

We move all terms to the left:

84-(-7x+63)=0

We get rid of parentheses

7x-63+84=0

We add all the numbers together, and all the variables

7x+21=0

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

7x=-21

x=-21/7

x=-3

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