3x-12=42.x

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



3x-12=42.x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3x-42.x-12=0

We add all the numbers together, and all the variables

-39x-12=0

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

-39x=12

x=12/-39

x=-4/13

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