19-x-7=21

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Solution for 19-x-7=21 equation: 



19-x-7=21

We move all terms to the left:

19-x-7-(21)=0

We add all the numbers together, and all the variables

-1x-9=0

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

-x=9

x=9/-1

x=-9

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