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-10-2x-1=3x+9
We move all terms to the left:
-10-2x-1-(3x+9)=0
We add all the numbers together, and all the variables
-2x-(3x+9)-11=0
We get rid of parentheses
-2x-3x-9-11=0
We add all the numbers together, and all the variables
-5x-20=0
We move all terms containing x to the left, all other terms to the right
-5x=20
x=20/-5
x=-4
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