12+15=3(4+x)

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Solution for 12+15=3(4+x) equation: 



12+15=3(4+x)

We move all terms to the left:

12+15-(3(4+x))=0

We add all the numbers together, and all the variables

-(3(x+4))+12+15=0

We add all the numbers together, and all the variables

-(3(x+4))+27=0



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

3(x+4)

We multiply parentheses

3x+12

Back to the equation:

-(3x+12)



We get rid of parentheses

-3x-12+27=0

We add all the numbers together, and all the variables

-3x+15=0

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

-3x=-15

x=-15/-3

x=+5

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