3x+2+x=12

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Solution for 3x+2+x=12 equation: 



3x+2+x=12

We move all terms to the left:

3x+2+x-(12)=0

We add all the numbers together, and all the variables

4x-10=0

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

4x=10

x=10/4

x=2+1/2

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