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5-4x=9.9x+8.9
We move all terms to the left:
5-4x-(9.9x+8.9)=0
We get rid of parentheses
-4x-9.9x-8.9+5=0
We add all the numbers together, and all the variables
-13.9x-3.9=0
We move all terms containing x to the left, all other terms to the right
-13.9x=3.9
x=3.9/-13.9
x=-2.0526315789474/7.3157894736842
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