1200(7-x)=1500x

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1200(7-x)=1500x
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1200(7-x)=1500x
1200(7-x)=1500x

1200(7-x)=1500x
1200(7-x)=1500x
1200*7-1200x=1500x
8400-1200x=1500x
1200x+1500x=8400
2700x=8400
x=8400÷2700
x=28/9
x=9分之28

x=1200×7÷2700=3.1111111111

x=28/9

1200/X)*1.2=1500/Y Y=250
7*240+200*7+7*0.4*50-1200-1500=520

1200*7-1200x=1500x
8400=1500x+1200x
8400=2700x
x=28/9