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27-(26-20)xx=9
We move all terms to the left:
27-(26-20)xx-(9)=0
We add all the numbers together, and all the variables
-6xx+27-9=0
We add all the numbers together, and all the variables
-6xx+18=0
We move all terms containing x to the left, all other terms to the right
-6xx=-18
x=-18/1
x=-18
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