7th grade math
posted by Chris on .
30 = 12d

d = 30/12 = 15/6 = 5/2 = 2 1/2

check 12*2 + 6 = 24+6 = 30 sure enough

The answer to 30=12d
d=18 
30=12d, this means 30 is equal to 12*?
You have to find the missing variable, so d would equal 2.5, or 2 1/2 
30=12d
Divide both sides by the coefficient.
12/12 leaves you with d.
30/12 leaves you with 2.5
D=2.5
Check your work.
30= 12*2.5
12*2.5= 30
30=30 
simplify 6 12/18