d+r=20

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Solution for d+r=20 equation: 


Simplifying
d + r = 20

Solving
d + r = 20

Solving for variable 'd'.

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

Add '-1r' to each side of the equation.
d + r + -1r = 20 + -1r

Combine like terms: r + -1r = 0
d + 0 = 20 + -1r
d = 20 + -1r

Simplifying
d = 20 + -1r

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