9x+21=12

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Solution for 9x+21=12 equation: 



9x+21=12

We move all terms to the left:

9x+21-(12)=0

We add all the numbers together, and all the variables

9x+9=0

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

9x=-9

x=-9/9

x=-1

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