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