7x-21=4x+12

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Solution for 7x-21=4x+12 equation: 



7x-21=4x+12

We move all terms to the left:

7x-21-(4x+12)=0

We get rid of parentheses

7x-4x-12-21=0

We add all the numbers together, and all the variables

3x-33=0

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

3x=33

x=33/3

x=11

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