3x+4+9=31-x

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Solution for 3x+4+9=31-x equation: 



3x+4+9=31-x

We move all terms to the left:

3x+4+9-(31-x)=0

We add all the numbers together, and all the variables

3x-(-1x+31)+4+9=0

We add all the numbers together, and all the variables

3x-(-1x+31)+13=0

We get rid of parentheses

3x+1x-31+13=0

We add all the numbers together, and all the variables

4x-18=0

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

4x=18

x=18/4

x=4+1/2

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