30=12-3(x+1)

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Solution for 30=12-3(x+1) equation: 



30=12-3(x+1)

We move all terms to the left:

30-(12-3(x+1))=0



We calculate terms in parentheses: -(12-3(x+1)), so:

12-3(x+1)

determiningTheFunctionDomain
-3(x+1)+12

We multiply parentheses

-3x-3+12

We add all the numbers together, and all the variables

-3x+9

Back to the equation:

-(-3x+9)



We get rid of parentheses

3x-9+30=0

We add all the numbers together, and all the variables

3x+21=0

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

3x=-21

x=-21/3

x=-7

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