x-20+2x=31

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Solution for x-20+2x=31 equation: 



x-20+2x=31

We move all terms to the left:

x-20+2x-(31)=0

We add all the numbers together, and all the variables

3x-51=0

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

3x=51

x=51/3

x=17

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