3x+12=45-x

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



3x+12=45-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x-(-1x+45)+12=0

We get rid of parentheses

3x+1x-45+12=0

We add all the numbers together, and all the variables

4x-33=0

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

4x=33

x=33/4

x=8+1/4

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