3x=57-12

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Solution for 3x=57-12 equation: 



3x=57-12

We move all terms to the left:

3x-(57-12)=0

We add all the numbers together, and all the variables

3x-45=0

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

3x=45

x=45/3

x=15

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