3b+4b=21

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Solution for 3b+4b=21 equation: 


Simplifying
3b + 4b = 21

Combine like terms: 3b + 4b = 7b
7b = 21

Solving
7b = 21

Solving for variable 'b'.

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

Divide each side by '7'.
b = 3

Simplifying
b = 3

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