(3+9)-D=8

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Solution for (3+9)-D=8 equation: 


Simplifying
(3 + 9) + -1D = 8

Combine like terms: 3 + 9 = 12
(12) + -1D = 8
12 + -1D = 8

Solving
12 + -1D = 8

Solving for variable 'D'.

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

Add '-12' to each side of the equation.
12 + -12 + -1D = 8 + -12

Combine like terms: 12 + -12 = 0
0 + -1D = 8 + -12
-1D = 8 + -12

Combine like terms: 8 + -12 = -4
-1D = -4

Divide each side by '-1'.
D = 4

Simplifying
D = 4

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