D-90=1

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Solution for D-90=1 equation: 


Simplifying
D + -90 = 1

Reorder the terms:
-90 + D = 1

Solving
-90 + D = 1

Solving for variable 'D'.

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

Add '90' to each side of the equation.
-90 + 90 + D = 1 + 90

Combine like terms: -90 + 90 = 0
0 + D = 1 + 90
D = 1 + 90

Combine like terms: 1 + 90 = 91
D = 91

Simplifying
D = 91

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