31+31+6x-20=180

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Solution for 31+31+6x-20=180 equation: 



31+31+6x-20=180

We move all terms to the left:

31+31+6x-20-(180)=0

We add all the numbers together, and all the variables

6x-138=0

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

6x=138

x=138/6

x=23

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