d-8r=13r

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Solution for d-8r=13r equation: 


Simplifying
d + -8r = 13r

Solving
d + -8r = 13r

Solving for variable 'd'.

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

Add '8r' to each side of the equation.
d + -8r + 8r = 13r + 8r

Combine like terms: -8r + 8r = 0
d + 0 = 13r + 8r
d = 13r + 8r

Combine like terms: 13r + 8r = 21r
d = 21r

Simplifying
d = 21r

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