3+9+x=4+2x

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Solution for 3+9+x=4+2x equation: 



3+9+x=4+2x

We move all terms to the left:

3+9+x-(4+2x)=0

We add all the numbers together, and all the variables

x-(2x+4)+3+9=0

We add all the numbers together, and all the variables

x-(2x+4)+12=0

We get rid of parentheses

x-2x-4+12=0

We add all the numbers together, and all the variables

-1x+8=0

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

-x=-8

x=-8/-1

x=+8

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