12x+3=45-9x

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Solution for 12x+3=45-9x equation: 



12x+3=45-9x

We move all terms to the left:

12x+3-(45-9x)=0

We add all the numbers together, and all the variables

12x-(-9x+45)+3=0

We get rid of parentheses

12x+9x-45+3=0

We add all the numbers together, and all the variables

21x-42=0

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

21x=42

x=42/21

x=2

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