Ayuda por favor con estas desigualdades : 'c1?

7. <img src="https://tex.z-dn.net/?f=%5Cfrac%7B2x-5%7D%7B4%7D%5Cleq3%5C%5C2x-5%5Cleq3%2A4%5C%5C2x-5%5Cleq12%5C%5C2x%5Cleq12%2B5%5C%5C2x%5Cleq17%5C%5Cx%5Cleq%5Cfrac%7B17%7D%7B2%7D" />Solución : <img src="https://tex.z-dn.net/?f=x%20%5Cin%20%28-%5Cinfty%20%3B%208.5%5D" />

8.

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B2x-9%7D%7B7%7D%3E0%5C%5C2x-9%3E0%5C%5C2x%3E9%5C%5Cx%3E%5Cfrac%7B9%7D%7B2%7D" />0 \ \ 2x - 9>0 \ \ 2x>9 \ \ x> \ frac{9}{2}" alt = " \ frac{2x - 9}{7}>0 \ \ 2x - 9>0 \ \ 2x>9 \ \ x> \ frac{9}{2}" align = "absmiddle" class = "latex - formula">Solución : <img src="https://tex.z-dn.net/?f=x%20%5Cin%20%289%20%3B%20%2B%5Cinfty%5D" />

10.

<img src="https://tex.z-dn.net/?f=%5Cfrac%7Bx-5%7D%7B4%7D%5Cleq%20x%5C%5Cx-5%5Cleq4x%5C%5C-5%5Cleq4x-x%5C%5C-5%5Cleq3x%5C%5C-%5Cfrac%7B5%7D%7B3%7D%5Cleq%20x" />Solución : <img src="https://tex.z-dn.net/?f=x%20%5Cin%20%5B-%5Cfrac%7B5%7D%7B3%7D%20%3B%20%2B%5Cinfty%29" />

14.

<img src="https://tex.z-dn.net/?f=10-3x%3E%5Cfrac%7B4x-5%7D%7B-3%7D%5C%5C%2810-3x%29%28-3%29%3C4x-5%5C%5C-30%2B9x%3C4x-5%5C%5C9x-4x%3C-5%2B30%5C%5C5x%3C25%5C%5Cx%3C%5Cfrac%7B25%7D%7B5%7D%5C%5Cx%3C5" /> \ frac{4x - 5}{ - 3} \ \ (10 - 3x)( - 3)" alt = "10 - 3x> \ frac{4x - 5}{ - 3} \ \ (10 - 3x)( - 3)" align = "absmiddle" class = "latex - formula">Solución : <img src="https://tex.z-dn.net/?f=x%20%5Cin%20%28-%5Cinfty%20%3B%205%29" />.