7x-21=12

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Solution for 7x-21=12 equation: 



7x-21=12

We move all terms to the left:

7x-21-(12)=0

We add all the numbers together, and all the variables

7x-33=0

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

7x=33

x=33/7

x=4+5/7

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