3n+51=12

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Solution for 3n+51=12 equation: 



3n+51=12

We move all terms to the left:

3n+51-(12)=0

We add all the numbers together, and all the variables

3n+39=0

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

3n=-39

n=-39/3

n=-13

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