12.4+x=3(4-1x)

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Solution for 12.4+x=3(4-1x) equation: 



12.4+x=3(4-1x)

We move all terms to the left:

12.4+x-(3(4-1x))=0

We add all the numbers together, and all the variables

x-(3(-1x+4))+12.4=0



We calculate terms in parentheses: -(3(-1x+4)), so:

3(-1x+4)

We multiply parentheses

-3x+12

Back to the equation:

-(-3x+12)



We get rid of parentheses

x+3x-12+12.4=0

We add all the numbers together, and all the variables

4x+0.4=0

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

4x=-0.4

x=-0.4/4

x=-0.4/4

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