D+d+d+d+d=25

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Solution for D+d+d+d+d=25 equation:


Simplifying
D + d + d + d + d = 25

Combine like terms: d + d = 2d
D + 2d + d + d = 25

Combine like terms: 2d + d = 3d
D + 3d + d = 25

Combine like terms: 3d + d = 4d
D + 4d = 25

Solving
D + 4d = 25

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.
D + 4d + -4d = 25 + -4d

Combine like terms: 4d + -4d = 0
D + 0 = 25 + -4d
D = 25 + -4d

Simplifying
D = 25 + -4d

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