3x-x=12+8

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



3x-x=12+8

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x-x-20=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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