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6x-(2x-9)=31
We move all terms to the left:
6x-(2x-9)-(31)=0
We get rid of parentheses
6x-2x+9-31=0
We add all the numbers together, and all the variables
4x-22=0
We move all terms containing x to the left, all other terms to the right
4x=22
x=22/4
x=5+1/2
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