I think that you are wanting to divide them..
so, your answer will be..
which would be
D=50
30/d = 0.6 rearrange as
d = 30/0.6 = 30 / (6/10) = 30/1 * 10/6 = 300/ 6 = 50 ........just as Hayley said.......!!!!!!
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d would equal 18 because you take both sides and multiply them by 30 in order to seperate 30 from d. so d= 18