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3-9(x-7)=12
We move all terms to the left:
3-9(x-7)-(12)=0
We add all the numbers together, and all the variables
-9(x-7)-9=0
We multiply parentheses
-9x+63-9=0
We add all the numbers together, and all the variables
-9x+54=0
We move all terms containing x to the left, all other terms to the right
-9x=-54
x=-54/-9
x=+6
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