U+r=d

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Solution for U+r=d equation: 


Simplifying
U + r = d

Solving
U + r = d

Solving for variable 'U'.

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

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

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

Simplifying
U = d + -1r

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