r+b=15

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Solution for r+b=15 equation: 


Simplifying
r + b = 15

Reorder the terms:
b + r = 15

Solving
b + r = 15

Solving for variable 'b'.

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

Add '-1r' to each side of the equation.
b + r + -1r = 15 + -1r

Combine like terms: r + -1r = 0
b + 0 = 15 + -1r
b = 15 + -1r

Simplifying
b = 15 + -1r

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