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y=240(1-0.75)^3
We move all terms to the left:
y-(240(1-0.75)^3)=0
We add all the numbers together, and all the variables
y-(240(0.25)^3)=0
We add all the numbers together, and all the variables
y-3.75=0
We move all terms containing y to the left, all other terms to the right
y=3.75
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