21-15=3(x-4)

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Solution for 21-15=3(x-4) equation: 



21-15=3(x-4)

We move all terms to the left:

21-15-(3(x-4))=0

We add all the numbers together, and all the variables

-(3(x-4))+6=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+6=0

We add all the numbers together, and all the variables

-3x+18=0

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

-3x=-18

x=-18/-3

x=+6

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