6d-3d-1=20

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Solution for 6d-3d-1=20 equation: 


Simplifying
6d + -3d + -1 = 20

Reorder the terms:
-1 + 6d + -3d = 20

Combine like terms: 6d + -3d = 3d
-1 + 3d = 20

Solving
-1 + 3d = 20

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 + 3d = 20 + 1

Combine like terms: -1 + 1 = 0
0 + 3d = 20 + 1
3d = 20 + 1

Combine like terms: 20 + 1 = 21
3d = 21

Divide each side by '3'.
d = 7

Simplifying
d = 7

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