18+x=21-9

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Solution for 18+x=21-9 equation: 



18+x=21-9

We move all terms to the left:

18+x-(21-9)=0

We add all the numbers together, and all the variables

x+18-12=0

We add all the numbers together, and all the variables

x+6=0

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

x=-6

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