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-12=3x+3(4x+21)
We move all terms to the left:
-12-(3x+3(4x+21))=0
We calculate terms in parentheses: -(3x+3(4x+21)), so:We get rid of parentheses
3x+3(4x+21)
We multiply parentheses
3x+12x+63
We add all the numbers together, and all the variables
15x+63
Back to the equation:
-(15x+63)
-15x-63-12=0
We add all the numbers together, and all the variables
-15x-75=0
We move all terms containing x to the left, all other terms to the right
-15x=75
x=75/-15
x=-5
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