3(3-d)-21=21d-6(2+4d)

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Solution for 3(3-d)-21=21d-6(2+4d) equation:


Simplifying
3(3 + -1d) + -21 = 21d + -6(2 + 4d)
(3 * 3 + -1d * 3) + -21 = 21d + -6(2 + 4d)
(9 + -3d) + -21 = 21d + -6(2 + 4d)

Reorder the terms:
9 + -21 + -3d = 21d + -6(2 + 4d)

Combine like terms: 9 + -21 = -12
-12 + -3d = 21d + -6(2 + 4d)
-12 + -3d = 21d + (2 * -6 + 4d * -6)
-12 + -3d = 21d + (-12 + -24d)

Reorder the terms:
-12 + -3d = -12 + 21d + -24d

Combine like terms: 21d + -24d = -3d
-12 + -3d = -12 + -3d

Add '12' to each side of the equation.
-12 + 12 + -3d = -12 + 12 + -3d

Combine like terms: -12 + 12 = 0
0 + -3d = -12 + 12 + -3d
-3d = -12 + 12 + -3d

Combine like terms: -12 + 12 = 0
-3d = 0 + -3d
-3d = -3d

Add '3d' to each side of the equation.
-3d + 3d = -3d + 3d

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

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

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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