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-4x=4x+5x
We move all terms to the left:
-4x-(4x+5x)=0
We add all the numbers together, and all the variables
-4x-(+9x)=0
We get rid of parentheses
-4x-9x=0
We add all the numbers together, and all the variables
-13x=0
x=0/-13
x=0
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