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30 = 12d

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

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

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 co-efficient.
12/12 leaves you with d.
30/12 leaves you with 2.5
D=2.5

30= 12*2.5
12*2.5= 30
30=30

simplify 6 12/18

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