8d-21=15

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Solution for 8d-21=15 equation: 


Simplifying
8d + -21 = 15

Reorder the terms:
-21 + 8d = 15

Solving
-21 + 8d = 15

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add '21' to each side of the equation.
-21 + 21 + 8d = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 8d = 15 + 21
8d = 15 + 21

Combine like terms: 15 + 21 = 36
8d = 36

Divide each side by '8'.
d = 4.5

Simplifying
d = 4.5

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