3+x=12-4x

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



3+x=12-4x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

x+4x-12+3=0

We add all the numbers together, and all the variables

5x-9=0

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

5x=9

x=9/5

x=1+4/5

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