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3-12=3(x+1)-15

We move all terms to the left:

3-12-(3(x+1)-15)=0

We add all the numbers together, and all the variables

-(3(x+1)-15)-9=0

We calculate terms in parentheses: -(3(x+1)-15), so:We get rid of parentheses

3(x+1)-15

We multiply parentheses

3x+3-15

We add all the numbers together, and all the variables

3x-12

Back to the equation:

-(3x-12)

-3x+12-9=0

We add all the numbers together, and all the variables

-3x+3=0

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

-3x=-3

x=-3/-3

x=1

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