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-1=9-2.5x
We move all terms to the left:
-1-(9-2.5x)=0
We add all the numbers together, and all the variables
-(-2.5x+9)-1=0
We get rid of parentheses
2.5x-9-1=0
We add all the numbers together, and all the variables
2.5x-10=0
We move all terms containing x to the left, all other terms to the right
2.5x=10
x=10/2.5
x=4
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