12x-3=9x-42

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Solution for 12x-3=9x-42 equation: 



12x-3=9x-42

We move all terms to the left:

12x-3-(9x-42)=0

We get rid of parentheses

12x-9x+42-3=0

We add all the numbers together, and all the variables

3x+39=0

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

3x=-39

x=-39/3

x=-13

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