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-21=3x+6(-x-6)
We move all terms to the left:
-21-(3x+6(-x-6))=0
We add all the numbers together, and all the variables
-(3x+6(-1x-6))-21=0
We calculate terms in parentheses: -(3x+6(-1x-6)), so:We get rid of parentheses
3x+6(-1x-6)
We multiply parentheses
3x-6x-36
We add all the numbers together, and all the variables
-3x-36
Back to the equation:
-(-3x-36)
3x+36-21=0
We add all the numbers together, and all the variables
3x+15=0
We move all terms containing x to the left, all other terms to the right
3x=-15
x=-15/3
x=-5
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