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