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