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

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Solution for 31=(x+4)+(3x+9) equation: 



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

We move all terms to the left:

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



We calculate terms in parentheses: -((x+4)+(3x+9)), so:

(x+4)+(3x+9)

We get rid of parentheses

x+3x+4+9

We add all the numbers together, and all the variables

4x+13

Back to the equation:

-(4x+13)



We get rid of parentheses

-4x-13+31=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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