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9=-2x-4
We move all terms to the left:
9-(-2x-4)=0
We get rid of parentheses
2x+4+9=0
We add all the numbers together, and all the variables
2x+13=0
We move all terms containing x to the left, all other terms to the right
2x=-13
x=-13/2
x=-6+1/2
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