r+d=y

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Solution for r+d=y equation: 


Simplifying
r + d = y

Reorder the terms:
d + r = y

Solving
d + r = y

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 = -1r + y

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

Simplifying
d = -1r + y

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