12x-(3-3x)=42

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Solution for 12x-(3-3x)=42 equation: 



12x-(3-3x)=42

We move all terms to the left:

12x-(3-3x)-(42)=0

We add all the numbers together, and all the variables

12x-(-3x+3)-42=0

We get rid of parentheses

12x+3x-3-42=0

We add all the numbers together, and all the variables

15x-45=0

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

15x=45

x=45/15

x=3

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