d+d=20

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Solution for d+d=20 equation: 


Simplifying
d + d = 20

Combine like terms: d + d = 2d
2d = 20

Solving
2d = 20

Solving for variable 'd'.

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

Divide each side by '2'.
d = 10

Simplifying
d = 10

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