(10-R)+(20-D)+(20-R)=0

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Solution for (10-R)+(20-D)+(20-R)=0 equation:


Simplifying
(10 + -1R) + (20 + -1D) + (20 + -1R) = 0

Remove parenthesis around (10 + -1R)
10 + -1R + (20 + -1D) + (20 + -1R) = 0

Remove parenthesis around (20 + -1D)
10 + -1R + 20 + -1D + (20 + -1R) = 0

Remove parenthesis around (20 + -1R)
10 + -1R + 20 + -1D + 20 + -1R = 0

Reorder the terms:
10 + 20 + 20 + -1D + -1R + -1R = 0

Combine like terms: 10 + 20 = 30
30 + 20 + -1D + -1R + -1R = 0

Combine like terms: 30 + 20 = 50
50 + -1D + -1R + -1R = 0

Combine like terms: -1R + -1R = -2R
50 + -1D + -2R = 0

Solving
50 + -1D + -2R = 0

Solving for variable 'D'.

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

Add '-50' to each side of the equation.
50 + -1D + -50 + -2R = 0 + -50

Reorder the terms:
50 + -50 + -1D + -2R = 0 + -50

Combine like terms: 50 + -50 = 0
0 + -1D + -2R = 0 + -50
-1D + -2R = 0 + -50

Combine like terms: 0 + -50 = -50
-1D + -2R = -50

Add '2R' to each side of the equation.
-1D + -2R + 2R = -50 + 2R

Combine like terms: -2R + 2R = 0
-1D + 0 = -50 + 2R
-1D = -50 + 2R

Divide each side by '-1'.
D = 50 + -2R

Simplifying
D = 50 + -2R

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