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x.10x+9=4x-9
We move all terms to the left:
x.10x+9-(4x-9)=0
We get rid of parentheses
x.10x-4x+9+9=0
We add all the numbers together, and all the variables
-4x+x.10x+18=0
We move all terms containing x to the left, all other terms to the right
-4x+x.10x=-18
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