3x-5+x=31.

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Solution for 3x-5+x=31. equation: 



3x-5+x=31.

We move all terms to the left:

3x-5+x-(31.)=0

We add all the numbers together, and all the variables

3x+x-5-31=0

We add all the numbers together, and all the variables

4x-36=0

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

4x=36

x=36/4

x=9

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