X-8r=r

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Solution for X-8r=r equation: 


Simplifying
X + -8r = r

Solving
X + -8r = r

Solving for variable 'X'.

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

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

Combine like terms: -8r + 8r = 0
X + 0 = r + 8r
X = r + 8r

Combine like terms: r + 8r = 9r
X = 9r

Simplifying
X = 9r

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