x-7=21-9

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Solution for x-7=21-9 equation: 



x-7=21-9

We move all terms to the left:

x-7-(21-9)=0

We add all the numbers together, and all the variables

x-7-12=0

We add all the numbers together, and all the variables

x-19=0

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

x=19

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