r+m=b

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Solution for r+m=b equation: 


Simplifying
r + m = b

Reorder the terms:
m + r = b

Solving
m + r = b

Solving for variable 'm'.

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

Add '-1r' to each side of the equation.
m + r + -1r = b + -1r

Combine like terms: r + -1r = 0
m + 0 = b + -1r
m = b + -1r

Simplifying
m = b + -1r

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