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300=20x+99
We move all terms to the left:
300-(20x+99)=0
We get rid of parentheses
-20x-99+300=0
We add all the numbers together, and all the variables
-20x+201=0
We move all terms containing x to the left, all other terms to the right
-20x=-201
x=-201/-20
x=10+1/20
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