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-(x+6)-(2x+9)=10
We move all terms to the left:
-(x+6)-(2x+9)-(10)=0
We get rid of parentheses
-x-2x-6-9-10=0
We add all the numbers together, and all the variables
-3x-25=0
We move all terms containing x to the left, all other terms to the right
-3x=25
x=25/-3
x=-8+1/3
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