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