3+7x-7=31

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Solution for 3+7x-7=31 equation: 



3+7x-7=31

We move all terms to the left:

3+7x-7-(31)=0

We add all the numbers together, and all the variables

7x-35=0

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

7x=35

x=35/7

x=5

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