(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(1000-x)×0.3-0.5x=260300-0.3x-0.5x=26

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

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