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4x-(x+9)=1
We move all terms to the left:
4x-(x+9)-(1)=0
We get rid of parentheses
4x-x-9-1=0
We add all the numbers together, and all the variables
3x-10=0
We move all terms containing x to the left, all other terms to the right
3x=10
x=10/3
x=3+1/3
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