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-4x-9=5x-90
We move all terms to the left:
-4x-9-(5x-90)=0
We get rid of parentheses
-4x-5x+90-9=0
We add all the numbers together, and all the variables
-9x+81=0
We move all terms containing x to the left, all other terms to the right
-9x=-81
x=-81/-9
x=+9
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