6B+9-2B=21

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Solution for 6B+9-2B=21 equation: 


Simplifying
6B + 9 + -2B = 21

Reorder the terms:
9 + 6B + -2B = 21

Combine like terms: 6B + -2B = 4B
9 + 4B = 21

Solving
9 + 4B = 21

Solving for variable 'B'.

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

Add '-9' to each side of the equation.
9 + -9 + 4B = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 4B = 21 + -9
4B = 21 + -9

Combine like terms: 21 + -9 = 12
4B = 12

Divide each side by '4'.
B = 3

Simplifying
B = 3

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