7x+63=21

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Solution for 7x+63=21 equation: 



7x+63=21

We move all terms to the left:

7x+63-(21)=0

We add all the numbers together, and all the variables

7x+42=0

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

7x=-42

x=-42/7

x=-6

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