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y-0.75(y)=1300
We move all terms to the left:
y-0.75(y)-(1300)=0
We add all the numbers together, and all the variables
0.25y-1300=0
We move all terms containing y to the left, all other terms to the right
0.25y=1300
y=1300/0.25
y=5200
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