53 [tex] \frac{9}{10} [/tex]
Subtract [tex] \frac{3}{10} [/tex] from both sides.
[tex] \frac{d}{7} [/tex] + [tex] \frac{3}{10} [/tex] - [tex] \frac{3}{10} [/tex] = 8 -
[tex] \frac{3}{10} [/tex]
Then simplify.
[tex] \frac{d}{7} [/tex] +[tex] \frac{3}{10} [/tex] - [tex] \frac{3}{10} [/tex] = [tex] \frac{d}{7} [/tex]
8 -[tex] \frac{3}{10} [/tex] =[tex] \frac{77}{10} [/tex]
[tex] \frac{d}{7} [/tex] = [tex] \frac{77}{10} [/tex]
Now Multiply both sides by 7
[tex] \frac{7d}{7} [/tex] = [tex] \frac{77 x 7}{10} [/tex]
Lastly simplify.
[tex] \frac{7d}{7} [/tex] = d
[tex] \frac{77 x 7}{10} [/tex] = [tex] \frac{539}{10} [/tex]
d =[tex] \frac{539}{10} [/tex]
Good luck! (:
