21b+9b=120

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Solution for 21b+9b=120 equation: 


Simplifying
21b + 9b = 120

Combine like terms: 21b + 9b = 30b
30b = 120

Solving
30b = 120

Solving for variable 'b'.

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

Divide each side by '30'.
b = 4

Simplifying
b = 4

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