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2.5(x-11.9)=9
We move all terms to the left:
2.5(x-11.9)-(9)=0
We multiply parentheses
2.5x-29.75-9=0
We add all the numbers together, and all the variables
2.5x-38.75=0
We move all terms containing x to the left, all other terms to the right
2.5x=38.75
x=38.75/2.5
x=15+1/2
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