2d-1-3d=4d-21

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Solution for 2d-1-3d=4d-21 equation:


Simplifying
2d + -1 + -3d = 4d + -21

Reorder the terms:
-1 + 2d + -3d = 4d + -21

Combine like terms: 2d + -3d = -1d
-1 + -1d = 4d + -21

Reorder the terms:
-1 + -1d = -21 + 4d

Solving
-1 + -1d = -21 + 4d

Solving for variable 'd'.

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

Add '-4d' to each side of the equation.
-1 + -1d + -4d = -21 + 4d + -4d

Combine like terms: -1d + -4d = -5d
-1 + -5d = -21 + 4d + -4d

Combine like terms: 4d + -4d = 0
-1 + -5d = -21 + 0
-1 + -5d = -21

Add '1' to each side of the equation.
-1 + 1 + -5d = -21 + 1

Combine like terms: -1 + 1 = 0
0 + -5d = -21 + 1
-5d = -21 + 1

Combine like terms: -21 + 1 = -20
-5d = -20

Divide each side by '-5'.
d = 4

Simplifying
d = 4

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