2x+63=21

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Solution for 2x+63=21 equation: 



2x+63=21

We move all terms to the left:

2x+63-(21)=0

We add all the numbers together, and all the variables

2x+42=0

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

2x=-42

x=-42/2

x=-21

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