x+b+b=9

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Solution for x+b+b=9 equation: 


Simplifying
x + b + b = 9

Reorder the terms:
b + b + x = 9

Combine like terms: b + b = 2b
2b + x = 9

Solving
2b + x = 9

Solving for variable 'b'.

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

Add '-1x' to each side of the equation.
2b + x + -1x = 9 + -1x

Combine like terms: x + -1x = 0
2b + 0 = 9 + -1x
2b = 9 + -1x

Divide each side by '2'.
b = 4.5 + -0.5x

Simplifying
b = 4.5 + -0.5x

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