3.9-d=12

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Solution for 3.9-d=12 equation: 


Simplifying
3.9 + -1d = 12

Solving
3.9 + -1d = 12

Solving for variable 'd'.

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

Add '-3.9' to each side of the equation.
3.9 + -3.9 + -1d = 12 + -3.9

Combine like terms: 3.9 + -3.9 = 0.0
0.0 + -1d = 12 + -3.9
-1d = 12 + -3.9

Combine like terms: 12 + -3.9 = 8.1
-1d = 8.1

Divide each side by '-1'.
d = -8.1

Simplifying
d = -8.1

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