12x+21=4x+42

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Solution for 12x+21=4x+42 equation: 



12x+21=4x+42

We move all terms to the left:

12x+21-(4x+42)=0

We get rid of parentheses

12x-4x-42+21=0

We add all the numbers together, and all the variables

8x-21=0

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

8x=21

x=21/8

x=2+5/8

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