D+3d-3d-1=18

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Solution for D+3d-3d-1=18 equation: 


Simplifying
D + 3d + -3d + -1 = 18

Reorder the terms:
-1 + D + 3d + -3d = 18

Combine like terms: 3d + -3d = 0
-1 + D + 0 = 18
-1 + D = 18

Solving
-1 + D = 18

Solving for variable 'D'.

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

Add '1' to each side of the equation.
-1 + 1 + D = 18 + 1

Combine like terms: -1 + 1 = 0
0 + D = 18 + 1
D = 18 + 1

Combine like terms: 18 + 1 = 19
D = 19

Simplifying
D = 19

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