12-(-3x)=54

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Solution for 12-(-3x)=54 equation: 



12-(-3x)=54

We move all terms to the left:

12-(-3x)-(54)=0

We add all the numbers together, and all the variables

-(-3x)-42=0

We get rid of parentheses

3x-42=0

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

3x=42

x=42/3

x=14

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