-12=3-x-4x

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Solution for -12=3-x-4x equation: 



-12=3-x-4x

We move all terms to the left:

-12-(3-x-4x)=0

We add all the numbers together, and all the variables

-(-5x+3)-12=0

We get rid of parentheses

5x-3-12=0

We add all the numbers together, and all the variables

5x-15=0

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

5x=15

x=15/5

x=3

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