.80(D-100)=D-100

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Solution for .80(D-100)=D-100 equation:


Simplifying
0.80(D + -100) = D + -100

Reorder the terms:
0.80(-100 + D) = D + -100
(-100 * 0.80 + D * 0.80) = D + -100
(-80 + 0.80D) = D + -100

Reorder the terms:
-80 + 0.80D = -100 + D

Solving
-80 + 0.80D = -100 + D

Solving for variable 'D'.

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

Add '-1D' to each side of the equation.
-80 + 0.80D + -1D = -100 + D + -1D

Combine like terms: 0.80D + -1D = -0.2D
-80 + -0.2D = -100 + D + -1D

Combine like terms: D + -1D = 0
-80 + -0.2D = -100 + 0
-80 + -0.2D = -100

Add '80' to each side of the equation.
-80 + 80 + -0.2D = -100 + 80

Combine like terms: -80 + 80 = 0
0 + -0.2D = -100 + 80
-0.2D = -100 + 80

Combine like terms: -100 + 80 = -20
-0.2D = -20

Divide each side by '-0.2'.
D = 100

Simplifying
D = 100

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