3(p-1)=12

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Solution for 3(p-1)=12 equation: 



3(p-1)=12

We move all terms to the left:

3(p-1)-(12)=0

We multiply parentheses

3p-3-12=0

We add all the numbers together, and all the variables

3p-15=0

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

3p=15

p=15/3

p=5

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