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1-(3x+9)=12-7x
We move all terms to the left:
1-(3x+9)-(12-7x)=0
We add all the numbers together, and all the variables
-(3x+9)-(-7x+12)+1=0
We get rid of parentheses
-3x+7x-9-12+1=0
We add all the numbers together, and all the variables
4x-20=0
We move all terms containing x to the left, all other terms to the right
4x=20
x=20/4
x=5
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