9b+9b=72

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Solution for 9b+9b=72 equation: 


Simplifying
9b + 9b = 72

Combine like terms: 9b + 9b = 18b
18b = 72

Solving
18b = 72

Solving for variable 'b'.

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

Divide each side by '18'.
b = 4

Simplifying
b = 4

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