7x-21=-84

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Solution for 7x-21=-84 equation: 



7x-21=-84

We move all terms to the left:

7x-21-(-84)=0

We add all the numbers together, and all the variables

7x+63=0

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

7x=-63

x=-63/7

x=-9

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