Hello !
You have to do as follow :
[tex] 2\div8-x=24\\0.25-x=24\\-x=24-0.25\\-x=23.75\\x=-23.75 [/tex]
[tex] If\ 2\div8-x=24,\ then\\\\\dfrac{2}{8}-x=24\\\\\dfrac{1}{4}-x=24\ \ \ |-\dfrac{1}{4}\\\\-x=23\dfrac{3}{4}\ \ \ |\cdot(-1)\\\\x=-23\dfrac{3}{4}\\\\If\ 2\div(8-x)=24,\ then\\\\\dfrac{2}{8-x}=\dfrac{24}{1}\ \ \ \ |cross\ multiply\\\\24(8-x)=2\ \ \ |use\ distributive\ property\\\\(24)(8)-(24)(x)=2\\\\192-24x=2\ \ \ |-192\\\\-24x=-190\ \ \ |:(-24)\\\\x=\dfrac{190}{24}\\\\x=7\dfrac{22}{24}\\\\x=7\dfrac{11}{12} [/tex]
