0.5x=0.75(1000-x)

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0.5x=0.75(1000-x)

0.5x=0.75(1000-x)
2x=3(1000-x)
2x=3000-3x
2x+3x=3000
5x=3000
x=600

600

0.5x=0.75*1000-0.75x
0.5x+0.75x=750
1.25x=750
x=600