12+x=+4x

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Solution for 12+x=+4x equation: 



12+x=+4x

We move all terms to the left:

12+x-(+4x)=0

We get rid of parentheses

x-4x+12=0

We add all the numbers together, and all the variables

-3x+12=0

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

-3x=-12

x=-12/-3

x=+4

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