r-x=9

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Solution for r-x=9 equation: 


Simplifying
r + -1x = 9

Solving
r + -1x = 9

Solving for variable 'r'.

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

Add 'x' to each side of the equation.
r + -1x + x = 9 + x

Combine like terms: -1x + x = 0
r + 0 = 9 + x
r = 9 + x

Simplifying
r = 9 + x

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