(x+500)*{(y+70)/100+1} =(x+1000)*(y/100+1)
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(x+500)*{(y+70)/100+1} =(x+1000)*(y/100+1)
![(x+500)*{(y+70)/100+1} =(x+1000)*(y/100+1)](/uploads/image/z/23303-47-3.jpg?t=%EF%BC%88x%EF%BC%8B500%EF%BC%89%2A%EF%BD%9B%EF%BC%88y%2B70%EF%BC%89%EF%BC%8F100%2B1%EF%BD%9D+%3D%EF%BC%88x%2B1000%EF%BC%89%2A%EF%BC%88y%EF%BC%8F100%2B1%EF%BC%89)
7X-50Y=15
(x+500)*{(y+70)/100+1} =(x+1000)*(y/100+1)
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