.80(D-100)=150

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Solution for .80(D-100)=150 equation: 


Simplifying
0.80(D + -100) = 150

Reorder the terms:
0.80(-100 + D) = 150
(-100 * 0.80 + D * 0.80) = 150
(-80 + 0.80D) = 150

Solving
-80 + 0.80D = 150

Solving for variable 'D'.

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

Add '80' to each side of the equation.
-80 + 80 + 0.80D = 150 + 80

Combine like terms: -80 + 80 = 0
0 + 0.80D = 150 + 80
0.80D = 150 + 80

Combine like terms: 150 + 80 = 230
0.80D = 230

Divide each side by '0.80'.
D = 287.5

Simplifying
D = 287.5

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