How do you solve \frac { 4} { d + 8} = \frac { 7} { d - 18}?

1 Answer
Nov 25, 2017

d=-(128)/(3)~=-42.667

Explanation:

We multiply in both sides by (d+8)(d-18) so we end up with:
(d-18)4=7(d+8)

we multiply,
4d-72=7d+56

we isolate d,
4d-7d=56+72

-3d=128

d=-(128)/(3)