12=3(7-x)

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Solution for 12=3(7-x) equation: 



12=3(7-x)

We move all terms to the left:

12-(3(7-x))=0

We add all the numbers together, and all the variables

-(3(-1x+7))+12=0



We calculate terms in parentheses: -(3(-1x+7)), so:

3(-1x+7)

We multiply parentheses

-3x+21

Back to the equation:

-(-3x+21)



We get rid of parentheses

3x-21+12=0

We add all the numbers together, and all the variables

3x-9=0

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

3x=9

x=9/3

x=3

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