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1.25(x-9)=15
We move all terms to the left:
1.25(x-9)-(15)=0
We multiply parentheses
1.25x-11.25-15=0
We add all the numbers together, and all the variables
1.25x-26.25=0
We move all terms containing x to the left, all other terms to the right
1.25x=26.25
x=26.25/1.25
x=21
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