2d=21+2d

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Solution for 2d=21+2d equation: 


Simplifying
2d = 21 + 2d

Add '-2d' to each side of the equation.
2d + -2d = 21 + 2d + -2d

Combine like terms: 2d + -2d = 0
0 = 21 + 2d + -2d

Combine like terms: 2d + -2d = 0
0 = 21 + 0
0 = 21

Solving
0 = 21

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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