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3-9(x=1)=3x+3(x-7)
We move all terms to the left:
3-9(x-(1))=0
We multiply parentheses
-9x+9+3=0
We add all the numbers together, and all the variables
-9x+12=0
We move all terms containing x to the left, all other terms to the right
-9x=-12
x=-12/-9
x=1+1/3
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