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-123=3x+6(-6x+18)
We move all terms to the left:
-123-(3x+6(-6x+18))=0
We calculate terms in parentheses: -(3x+6(-6x+18)), so:We get rid of parentheses
3x+6(-6x+18)
We multiply parentheses
3x-36x+108
We add all the numbers together, and all the variables
-33x+108
Back to the equation:
-(-33x+108)
33x-108-123=0
We add all the numbers together, and all the variables
33x-231=0
We move all terms containing x to the left, all other terms to the right
33x=231
x=231/33
x=7
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