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-7(3x-6)=-105
We move all terms to the left:
-7(3x-6)-(-105)=0
We add all the numbers together, and all the variables
-7(3x-6)+105=0
We multiply parentheses
-21x+42+105=0
We add all the numbers together, and all the variables
-21x+147=0
We move all terms containing x to the left, all other terms to the right
-21x=-147
x=-147/-21
x=+7
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