r+x=q

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Solution for r+x=q equation: 


Simplifying
r + x = q

Solving
r + x = q

Solving for variable 'r'.

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

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

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

Simplifying
r = q + -1x

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