d+7=d-7

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Solution for d+7=d-7 equation: 


Simplifying
d + 7 = d + -7

Reorder the terms:
7 + d = d + -7

Reorder the terms:
7 + d = -7 + d

Add '-1d' to each side of the equation.
7 + d + -1d = -7 + d + -1d

Combine like terms: d + -1d = 0
7 + 0 = -7 + d + -1d
7 = -7 + d + -1d

Combine like terms: d + -1d = 0
7 = -7 + 0
7 = -7

Solving
7 = -7

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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