12x-15=30x-3x

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Solution for 12x-15=30x-3x equation: 



12x-15=30x-3x

We move all terms to the left:

12x-15-(30x-3x)=0

We add all the numbers together, and all the variables

12x-(+27x)-15=0

We get rid of parentheses

12x-27x-15=0

We add all the numbers together, and all the variables

-15x-15=0

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

-15x=15

x=15/-15

x=-1

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