3+7x-x=57

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Solution for 3+7x-x=57 equation: 



3+7x-x=57

We move all terms to the left:

3+7x-x-(57)=0

We add all the numbers together, and all the variables

6x-54=0

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

6x=54

x=54/6

x=9

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