[tex]8(5 - x) \leqslant 10(8 - x) \\ 40 - 8x \leqslant 80 - 10x \\ - 8x + 10x \leqslant 80 - 40 \\ 2x \leqslant 40 \\ x \leqslant \frac{40}{2} \\ x \leqslant 20[/tex]
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[tex]8(5 - x) \leqslant 10(8 - x) \\ 40 - 8x \leqslant 80 - 10x \\ - 8x + 10x \leqslant 80 - 40 \\ 2x \leqslant 40 \\ x \leqslant \frac{40}{2} \\ x \leqslant 20[/tex]