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-2(x-7)-(x+6)=-1
We move all terms to the left:
-2(x-7)-(x+6)-(-1)=0
We add all the numbers together, and all the variables
-2(x-7)-(x+6)+1=0
We multiply parentheses
-2x-(x+6)+14+1=0
We get rid of parentheses
-2x-x-6+14+1=0
We add all the numbers together, and all the variables
-3x+9=0
We move all terms containing x to the left, all other terms to the right
-3x=-9
x=-9/-3
x=+3
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