7-x=3(x+9)

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Solution for 7-x=3(x+9) equation: 



7-x=3(x+9)

We move all terms to the left:

7-x-(3(x+9))=0

We add all the numbers together, and all the variables

-1x-(3(x+9))+7=0



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

3(x+9)

We multiply parentheses

3x+27

Back to the equation:

-(3x+27)



We get rid of parentheses

-1x-3x-27+7=0

We add all the numbers together, and all the variables

-4x-20=0

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

-4x=20

x=20/-4

x=-5

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