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(40-5n)=(50-4(2n-2)
We move all terms to the left:
(40-5n)-((50-4(2n-2))=0
We add all the numbers together, and all the variables
(-5n+40)-((50-4(2n-2))=0
We get rid of parentheses
-5n-((50-4(2n-2))+40=0
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