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3x-(2x-1)=-9x-1
We move all terms to the left:
3x-(2x-1)-(-9x-1)=0
We get rid of parentheses
3x-2x+9x+1+1=0
We add all the numbers together, and all the variables
10x+2=0
We move all terms containing x to the left, all other terms to the right
10x=-2
x=-2/10
x=-1/5
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