3X+9X=4(x+7)

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Solution for 3X+9X=4(x+7) equation: 



3X+9X=4(X+7)

We move all terms to the left:

3X+9X-(4(X+7))=0

We add all the numbers together, and all the variables

12X-(4(X+7))=0



We calculate terms in parentheses: -(4(X+7)), so:

4(X+7)

We multiply parentheses

4X+28

Back to the equation:

-(4X+28)



We get rid of parentheses

12X-4X-28=0

We add all the numbers together, and all the variables

8X-28=0

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

8X=28

X=28/8

X=3+1/2

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