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7x-(2x+9)=4x-1
We move all terms to the left:
7x-(2x+9)-(4x-1)=0
We get rid of parentheses
7x-2x-4x-9+1=0
We add all the numbers together, and all the variables
x-8=0
We move all terms containing x to the left, all other terms to the right
x=8
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