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-(5x+4)-(4x-9)=7
We move all terms to the left:
-(5x+4)-(4x-9)-(7)=0
We get rid of parentheses
-5x-4x-4+9-7=0
We add all the numbers together, and all the variables
-9x-2=0
We move all terms containing x to the left, all other terms to the right
-9x=2
x=2/-9
x=-2/9
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