x+3x+x+3x=12+2x+6

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Solution for x+3x+x+3x=12+2x+6 equation: 



x+3x+x+3x=12+2x+6

We move all terms to the left:

x+3x+x+3x-(12+2x+6)=0

We add all the numbers together, and all the variables

x+3x+x+3x-(2x+18)=0

We add all the numbers together, and all the variables

8x-(2x+18)=0

We get rid of parentheses

8x-2x-18=0

We add all the numbers together, and all the variables

6x-18=0

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

6x=18

x=18/6

x=3

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