(1000-x)×0.3-0.5x=260

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(1000-x)×0.3-0.5x=260
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(1000-x)×0.3-0.5x=260
(1000-x)×0.3-0.5x=260

(1000-x)×0.3-0.5x=260
300-0.3x-0.5x=260
300-(0.3x+0.5x)=260
300-0.8x=260
0.8x=300-260
0.8x=40
x=50

(1000-x)×0.3-0.5x=260
300-0.3x-0.5x=260
0.8x=300-260
0.8x=40
x=40÷0.8
x=50

300-0.3x-0.5x=260
-0.8x=-40
x=50