4=21x+12

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Solution for 4=21x+12 equation: 



4=21x+12

We move all terms to the left:

4-(21x+12)=0

We get rid of parentheses

-21x-12+4=0

We add all the numbers together, and all the variables

-21x-8=0

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

-21x=8

x=8/-21

x=-8/21

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