8b+9-2b=21

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Solution for 8b+9-2b=21 equation:


Simplifying
8b + 9 + -2b = 21

Reorder the terms:
9 + 8b + -2b = 21

Combine like terms: 8b + -2b = 6b
9 + 6b = 21

Solving
9 + 6b = 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 + 6b = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 6b = 21 + -9
6b = 21 + -9

Combine like terms: 21 + -9 = 12
6b = 12

Divide each side by '6'.
b = 2

Simplifying
b = 2

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