3+9=4(x+7)

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



3+9=4(x+7)

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(4(x+7))+12=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

-4x-28+12=0

We add all the numbers together, and all the variables

-4x-16=0

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

-4x=16

x=16/-4

x=-4

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