12=15-3x

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Solution for 12=15-3x equation: 



12=15-3x

We move all terms to the left:

12-(15-3x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3x-15+12=0

We add all the numbers together, and all the variables

3x-3=0

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

3x=3

x=3/3

x=1

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