8+12+x=3x

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Solution for 8+12+x=3x equation: 



8+12+x=3x

We move all terms to the left:

8+12+x-(3x)=0

We add all the numbers together, and all the variables

-2x+20=0

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

-2x=-20

x=-20/-2

x=+10

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